Nuaire FAITH-PLUS dMEV Extractor Fan

Health & Safety Considerations

Confirm safe access, stable footing and good lighting before you begin. Wear eye protection and a dust mask when core-drilling or chasing walls, and gloves when handling sharp grilles or ductwork.

Treat concealed services as live until proven otherwise and use a detector to check for hidden cables and pipes. Do not core-drill near gas flues, boiler terminals or other ventilation outlets. Keep the fan and ductwork clear of heat sources and do not obstruct any fire barriers.

Observe the bathroom electrical zones and ask your electrician to advise on a safe mounting position in relation to baths or showers. Work methodically, keep the area tidy and avoid working alone in hot or very cold conditions. Electrical work must be completed via a suitably rated isolator by a qualified electrician.

Site Preparation

Decide which room you are ventilating and choose a position that will remove moist, stale air efficiently without creating draughts. In bathrooms the usual position is high on an external wall or high on a ceiling with a short duct run to outside. Aim to keep the duct route short and straight, with as few bends as possible.

Confirm that the chosen wall or ceiling can accept fixings and, for through-wall installation, that you can core-drill to the outside without obstruction. Plan the route for the local isolator and discuss the cable run with your electrician.

If replacing an existing fan, check what size duct is already present and whether a backdraught shutter and external grille are in good condition. Ensure there is space to remove the fascia for cleaning after installation.

Limitations And Good Practice

This is a continuous running extract fan designed to remove air from a single wet room. It must not be used to extract hazardous fumes or connected into flues or chimneys. Keep the duct bore consistent from fan to outside and seal every joint airtight to prevent losses and noise.

Where you route through a cold roof void, insulate the duct to reduce the risk of condensation. For horizontal through-wall installations set a slight fall towards the exterior so any incidental moisture drains outside. Fit a weather-protected external grille or cowl with insect mesh and, where wind exposure is significant, include a quality backdraught shutter.

Do not mount the fan where a door or large fitting will block the airflow path. Leave clearance around the casing so the fascia can be removed for cleaning. Agree in advance how boost will be activated, for example by the fan’s integral humidistat, by a switch-live from the room light, or by a dedicated boost switch.

Step-By-Step Installation

1. Make The Area Safe: Isolate any circuits you may encounter, verify the drilling zone is free of services using a detector and mark out the fan position and duct route.
   
   

2. Core-drill Or Cut The Duct Opening: For a through-wall installation, drill a clean core hole to the outside at the required diameter. Angle the hole very slightly to the exterior to encourage any incidental moisture to drain outwards. For a ceiling installation, cut the ceiling aperture and plan the shortest practicable route to an external termination. Deburr and clean openings.
   
   

3. Install The External Termination: From outside, offer up the weather cowl or grille, mark fixings, drill and plug as required, then seal the back face with a continuous bead of suitable exterior sealant. Fix the cowl square and tight to the wall to prevent water ingress. If using a wall sleeve or telescopic duct, cut to length and insert so it is fully home in the cowl spigot.
   
   

4. Fit The Ductwork: Insert the duct sleeve through the wall or route flexible or rigid duct to the termination. Keep bends gentle and the bore unobstructed. Seal all joints with appropriate mastic or tape and secure with bands or clamps. In loft or void spaces, insulate the duct to limit condensation.
   
   

5. Mount The Fan Body: Offer the backplate to the mounting surface, check it is level, mark and drill fixings, then secure with appropriate plugs and screws for the substrate. Ensure that cable entry is neat and that there is sufficient clearance to remove the fascia for cleaning.
   
   

6. Make The Electrical Connection: Your qualified electrician should install the local isolator, complete the fixed wiring to the fan and provide any boost control input required. Do not energise the circuit until the installation is complete and covers are in place.
   
   

7. Attach The Duct To The Fan: Push the duct fully over the fan spigot and secure it airtight with a clamp or band. Confirm that the backdraught shutter, if present, moves freely.
   
   

8. Fit The Fascia: Clip or screw the fascia into place, ensuring the airflow path is clear and the intake is not obstructed by sealant or debris.
   
   

9. Commission The Fan: Restore power at the isolator. Using the fan’s control interface, select the installation type and set the background (trickle) airflow appropriate to the room size. Set the boost airflow to meet the required extract rate, then configure how boost is triggered. If you are using the integral humidistat, set a sensible humidity level so the fan responds to steam without nuisance operation. If you are using a timer, set the run-on period so the fan continues to extract for a short time after the trigger has ended. Enable constant airflow mode if available so the fan maintains the set duty against wind and duct resistance.
   
   

10. Prove Operation And Finish: With the room door slightly ajar, confirm a smooth, even extract at the fascia and check that air is discharging freely from the exterior cowl. Test the chosen boost trigger and verify that the fan returns to background speed after the run-on or when humidity falls. Seal around penetrations where needed, tidy the work area and label the isolator clearly.

Handover And Everyday Use

Explain to the household that the fan runs quietly in the background at a low rate and will increase speed automatically when moisture is produced or when a boost trigger is used.

Day-to-day adjustment is rarely required. Encourage the occupant to keep the fascia free of dust and to leave the isolator on so the fan can provide continuous protection against condensation and black mould. Remind them that a slightly open under-cut on the room door helps makeup air reach the fan for best performance.

Maintenance And Aftercare

Routine care is simple. Every few months, isolate the power and lift off the fascia. Wash the fascia in warm soapy water, rinse and dry. Gently vacuum the impeller and interior with a soft brush attachment, taking care not to disturb any sensors.

Check that the backdraught shutter opens and closes freely and that duct joints remain airtight. Inspect the external cowl and clear any debris from the mesh. Refit the fascia and restore power.

During periodic electrical checks, your electrician can confirm that trickle and boost settings are still appropriate and that the run-on and humidity response suit the way the room is used.

Ancillary Products

For a neat, compliant Faith-PLUS installation and a tidy finish, dedicated accessories are avilable for window mounting, through-wall routing and wall finishing. They are sized to the fan’s spigot, include colour-matched options to suit the façade, and simplify drilling, weatherproofing and alignment.

They also help you maintain a short, well sealed, low resistance duct path. Choose the items suited to your route and substrate, keep runs as straight as possible, seal every joint airtight, and set a slight outward fall on sleeves so incidental moisture drains to the exterior.

• Faith-PLUS Window Kit (FAITH-WKIT): Required for window installations and supplied separately. The kit provides the purpose-made components needed to mount the fan safely through glazing, maintain weather protection and achieve a professional internal and external finish.
  
  

• Faith-PLUS Wall plate 250×250mm (FAITH-WP): A rigid finishing plate that levels uneven substrates, covers oversize or imperfect cores, and gives a clean perimeter detail around the appliance so the fascia sits square and flush.
  
  

• Through-Wall Kit 100mm (FAITH-WALLKIT-WH, FAITH-WALLKIT-COT, FAITH-WALLKIT-TC, FAITH-WALLKIT-BR): Colour-matched through-wall solutions in White, Cotswold Beige, Terracotta or Brown. Each kit is designed to deliver a straightforward, weather-tight 100mm penetration with a low-resistance external termination and an adjustable wall sleeve for an accurate fit to wall thickness while coordinating with the façade.

Troubleshooting

If airflow feels weak, first clean the fascia and check that the external cowl and mesh are not blocked. Confirm that doors have a small under-cut so replacement air can enter the room.

If condensation persists, increase the background airflow slightly and review how boost is triggered.

If the fan is noisy, look for kinks or tight bends in the duct, check that the fan is mounted flat and firm, and confirm that all joints are airtight. Rattles are commonly caused by a loose fascia or a shutter catching on a misaligned sleeve.

If the fan does not run, check the local isolator and protective fuse, then ask your electrician to verify the supply.

If the fan does not boost when expected, review the trigger method. Lower the humidity set point a little, extend the run-on time or verify that a switch-live feed is present when the room light is on, according to how you chose to control boost.

Q) What is the Nuaire Faith-PLUS and what problem is it designed to solve?

A) Nuaire Faith-PLUS is a compact, filterless, continuous-running dMEV extract fan for bathrooms, en-suites, WCs and other wet rooms. It runs quietly at a constant background rate and intelligently boosts when required, so moisture, odours and everyday indoor pollutants are removed steadily at source. By maintaining this gentle but continuous extraction, Faith-PLUS helps to stop surface condensation forming on cold walls, ceilings and window reveals, which in turn discourages black mould growth and musty smells while protecting décor and building fabric. The fan’s mixed-flow design delivers reliable airflow with low electrical demand, making it acceptable for continuous operation in occupied homes. It is recognised in the SAP Product Characteristic Database and is configured to achieve Approved Document F extract performance while supporting Part L energy targets, giving householders, landlords and installers a compliant, low-disruption solution.

Q) How does the Nuaire Faith-PLUS work and what makes it different from an intermittent fan?

A) Faith-PLUS is a decentralised mechanical extract ventilation fan that runs continuously at a low trickle rate to create a gentle, constant draw from the wet room. This background flow steadily removes moisture-laden air and stale odours as they are produced, rather than waiting for a timer or light switch after activity has finished. When humidity rises or a boost trigger is used, the fan automatically increases speed, then returns to its background rate as conditions normalise. Unlike intermittent fans that start and stop, continuous dMEV maintains stable indoor conditions, reduces noise peaks and helps avoid nuisance draughts. Faith-PLUS adds intelligence through its integral humidistat, configurable run-on timer, night-time delay and a constant airflow mode that compensates for wind and system resistance, so the selected duty is delivered reliably day after day.

Q) Where should the Nuaire Faith-PLUS be used and which rooms benefit most?

A) Faith-PLUS is intended for moisture-producing spaces that need dependable, low-energy extraction. Typical locations include bathrooms, en-suites, shower rooms, WCs and utility or laundry areas. In compact domestic kitchens or small cooking spaces the configurable boost and run-on timer help clear humid, stale air after use. Because the fan is designed for a single room, you would fit one unit per wet space rather than attempting whole-home extract from a single point. The compact casing, choice of through-wall or short-duct routes and suitability for wall, ceiling or window mounting (with the appropriate kit) make it versatile for both new build and retrofit. Correct placement high on an external wall or ceiling, with a short, straight route to outside, ensures efficient removal of moisture without creating draughts.

Q) What is the difference between Nuaire Faith-PLUS 230V and Faith-PLUS SELV 24V?

A) Both variants share the same performance, controls and feature set, including adjustable trickle and boost speeds, integral humidistat, timer functions, constant airflow mode, a 3-button 7-segment display, daily run monitor, SAP PCDB recognition and a 5-year warranty. Faith-PLUS 230V connects directly to a 220–240V~ supply and suits most standard bathroom and WC installations. Faith-PLUS SELV 24V is supplied via a Safety Extra Low Voltage source and is preferred where additional electrical separation in wet areas is desirable or where site rules specify SELV equipment. Both are IPX4 when wall mounted, employ a high-efficiency DC brushless motor with ball bearings and locked-rotor protection, and deliver the same quiet mixed-flow performance. The choice typically depends on risk assessment, installation zones and client specification, rather than on airflow capability.

Q) Does the Nuaire Faith-PLUS meet Building Regulations Part F and support Part L energy targets?

A) Yes. Faith-PLUS is designed as a continuous-running dMEV solution that achieves extract performance in line with Approved Document F when commissioned correctly for the room size and duty required. The range is recognised in the Government’s SAP Product Characteristic Database, which supports compliance calculations and helps demonstrate predicted energy performance. Continuous background extract with intelligent boost is an established method within Part F, and the fan’s low electrical demand and mixed-flow efficiency support Part L objectives. Features such as constant airflow control, night-time delay, integral humidistat and configurable run-on help deliver the required ventilation rates without unnecessary energy use, while the daily run monitor aids verification during maintenance and portfolio checks.

Q) How quiet is the Nuaire Faith-PLUS in everyday use?

A) When installed and commissioned correctly with a short, well-sealed duct run, Faith-PLUS is designed to operate unobtrusively, with quoted sound levels around 25 dBA at 3 metres. The mixed-flow impeller and efficient DC motor minimise tonal noise and vibration, while constant background running avoids the on–off surges common with intermittent fans. Selecting the appropriate trickle rate for the room, avoiding tight bends and kinks, and ensuring joints are airtight all contribute to a smooth, low-noise installation. During boost, sound rises as airflow increases, but the run-on timer and humidity logic return the fan to a quiet background rate as soon as the peak moisture load has been cleared, maintaining comfort for occupants.

Q) What airflow rates and control options are available on the Nuaire Faith-PLUS?

A) Commissioning is carried out via a simple 3-button, 3-digit 7-segment display on the fascia. You select a trickle airflow within a typical 4–20 litres per second band to suit the room and dwelling, then choose a boost airflow up to approximately 29 litres per second, which equates to about 104 m³/h. The integral humidistat can automatically raise the fan to boost when relative humidity rises, and a configurable run-on timer keeps extraction going briefly after demand ends. Additional options include a switch-live or pull-cord input for manual boost, a night-time delay to prevent nuisance boosting during sleep hours, and a constant airflow mode that compensates for wind and system resistance to maintain the set duty reliably.

Q) How does the integral humidistat in the Nuaire Faith-PLUS work and how should it be set?

A) The integral humidistat continually samples the air drawn through the fan. When relative humidity rises above the set threshold, the unit automatically increases to boost airflow to accelerate moisture removal. As conditions normalise, the fan returns to its background rate. During commissioning, select a sensible humidity set point that responds to steam from showers and baths without frequent nuisance activation. Many homes benefit from a middle setting that prevents lingering humidity while avoiding unnecessary boosting during brief spikes. The night-time delay function can be enabled where desired to suppress boost triggers during designated hours, supporting restful sleep while the continuous trickle rate maintains essential background extraction throughout the night.

Q) What is constant airflow mode on the Nuaire Faith-PLUS and when should I use it?

A) Constant airflow mode enables the fan to self-adjust its speed to deliver the airflow rate you commissioned, even if external conditions change. Wind pressure, stack effects and minor variations in duct resistance can otherwise cause fluctuations in extract performance. With constant airflow enabled, Faith-PLUS continuously monitors its duty and compensates so the set trickle or boost flow is achieved more consistently. This is especially useful on wind-exposed façades, in taller buildings with pressure variations, or where short duct runs still experience local resistance changes from grilles and shutters. Enabling the feature during commissioning helps maintain compliance with the selected duty and ensures predictable moisture control throughout the year.

Q) How do I commission the Nuaire Faith-PLUS for best performance?

A) After installation, power the unit at the local isolator and use the fascia’s 3-button interface to select the installation type so the fan calibrates for the route resistance typical of through-wall or ducted arrangements. Set the background trickle rate appropriate to the room and occupancy, then select a boost rate that meets the extract requirement in Approved Document F. Configure how boost is triggered, whether via the integral humidistat, a switch-live from the room light, a pull-cord, or a combination. Adjust the run-on timer to keep clearing moisture briefly after activity ends, and enable constant airflow mode where stability is important. Finish with a functional check: verify steady extract at trickle, confirm boost and run-on work as intended, and ensure air discharges freely outside.

Q) What are the best installation practices and siting tips for the Nuaire Faith-PLUS?

A) Choose a position high on an external wall or ceiling where humid air accumulates and where a short, straight route to the outside is possible. Keep the duct bore consistent from fan to termination, seal every joint airtight and avoid tight bends or crushed sections. For through-wall routes, set a slight outward fall so any incidental moisture drains outside. Fit a weather-protected external grille or cowl with insect mesh, and include a quality backdraught shutter where exposure is significant. If routing through a cold roof void, insulate the duct to reduce the risk of internal condensation. Leave clearance to remove the fascia for cleaning, and agree with the electrician how boost will be triggered so the wiring and controls suit the occupant’s routine.

Q) Can the Nuaire Faith-PLUS be fitted in a window, ceiling or only through a wall?

A) Faith-PLUS is flexible. It can be fitted through a wall as standard, mounted on a ceiling with a short duct route to an external termination, or installed in a window using the appropriate, purpose-made window kit. During commissioning, you select the installation type within the control menu so the unit calibrates its trickle, comfort boost and full boost settings to deliver the chosen airflow against the expected route resistance. Regardless of route, the same core principles apply: keep the path short and straight, seal every joint, ensure the external termination is weather-tight and unobstructed, and position the internal fan so it can be cleaned easily by lifting the tool-free fascia.

Q) How much does the Nuaire Faith-PLUS cost to run and is it energy efficient?

A) Faith-PLUS uses a high-efficiency DC brushless motor with ball bearings and locked-rotor protection, designed for low electrical demand during continuous operation. Continuous dMEV removes moisture steadily at source, reducing the need for prolonged high-speed bursts and helping manage energy use across the day. Features such as the integral humidistat, run-on timer, night-time delay and constant airflow control tailor extraction to actual conditions, ensuring ventilation is delivered when it is needed and quietly maintained at background when it is not. In practice, householders experience modest running costs while benefitting from more stable indoor conditions, less condensation and improved comfort, with SAP PCDB recognition supporting compliance and predicted energy assessments.

Q) What maintenance does the Nuaire Faith-PLUS need and how often should it be cleaned?

A) The filterless design keeps routine care simple and low-cost. Every few months, isolate power at the local spur, lift off the fascia without tools and wash it in warm soapy water before rinsing and drying. Gently vacuum the impeller and interior with a soft brush, taking care not to disturb sensors. Check that the backdraught shutter moves freely, that all duct joints remain airtight, and that the external cowl and insect mesh are clear of debris. Refit the fascia and restore power. During periodic electrical checks, confirm that trickle and boost rates are still appropriate, that the humidistat set point suits the household, and that the daily run monitor reflects expected operation. Keeping the fascia clear and the duct path unobstructed preserves airflow, hygiene and efficiency.

Q) What warranty and certifications does the Nuaire Faith-PLUS have?

A) Faith-PLUS carries a 5-year warranty, reflecting robust design for long service life in continuous operation. The product is recognised within the Government’s SAP Product Characteristic Database, supporting compliance calculations and energy assessments under the Building Regulations. IPX4 protection when wall mounted and robust ABS construction suit wet-room environments, while the mixed-flow fan and DC motor design underpin quiet, efficient performance. The inclusion of a daily run monitor aids portfolio checks and planned maintenance, particularly in social housing and managed schemes that target condensation and mould reduction across multiple dwellings. For specific installation scenarios, Nuaire’s accessory kits provide compliant, tidy routes through walls and glazing.

Q) Can the Nuaire Faith-PLUS be used in small kitchens and utility rooms as well as bathrooms?

A) Yes, provided the duty is matched to the space and moisture load. In compact domestic kitchens, utility rooms and laundry spaces, the adjustable boost up to approximately 29 l/s and configurable run-on timer help clear humid, stale air effectively after cooking or drying clothes. For larger or heavily used kitchens a dedicated kitchen extract solution may still be appropriate, but in smaller spaces Faith-PLUS delivers steady background extract with responsive boost, maintaining comfortable conditions without intrusive noise. As with bathrooms, position the unit to capture humid air effectively, keep the duct route short and straight, and commission the airflow to meet Approved Document F requirements for the chosen room type.

Q) How does the Nuaire Faith-PLUS help landlords and housing managers meet portfolio goals?

A) Faith-PLUS combines low-disruption installation, simple commissioning and predictable maintenance with features that support oversight. The daily run monitor provides a quick operational check during visits, while SAP PCDB recognition assists compliance documentation. The filterless fascia lifts off without tools for easy cleaning, reducing service time and life-cycle cost. Constant airflow control maintains the commissioned duty despite wind and resistance changes, supporting consistent outcomes across varied properties. With quiet operation, low running costs and a 5-year warranty, the fan offers long-term value. In retrofit programmes focused on condensation and mould reduction, these qualities translate into fewer call-backs, improved tenant comfort and clearer evidence of continuous ventilation.

Q) What are the limitations of the Nuaire Faith-PLUS and what should it not be used for?

A) Faith-PLUS is a continuous-running extract fan for a single wet room and is not intended for hazardous fumes, grease-laden commercial cooking extract, or connection to chimneys or flues. It must not be used to ventilate multiple rooms via branched ductwork. Duct diameter should remain consistent from the fan to the outside, with all joints sealed airtight to prevent leakage and noise. Where ducts pass through cold voids they should be insulated to reduce internal condensation risk. The fan is IPX4 when wall mounted, but bathroom electrical zones and siting rules still apply, so a qualified electrician must advise on location and complete the connection via a suitably rated isolator. Correct commissioning is essential to achieve the required duty and regulatory compliance.

Q) How do I choose trickle and boost settings on the Nuaire Faith-PLUS for my bathroom?

A) Begin with the Approved Document F minimum extract rates for your room type. Using the fascia’s 3-button control, select an installation type so the fan calibrates to the expected route resistance, then set a background trickle rate within the typical 4–20 l/s band that keeps the room fresh between peaks. Next, select a boost rate up to approximately 29 l/s that clears steam effectively after showers or baths. Decide how boost will be triggered—integral humidistat, switch-live from the room light, pull-cord, or a combination—and set a sensible run-on time so the fan continues to extract briefly after activity ends. Enable constant airflow mode where conditions vary, and review performance over the first week, adjusting settings slightly if needed to balance noise, comfort and moisture control.

Q) Is the Nuaire Faith-PLUS suitable for retrofit and what should I look out for when replacing an existing fan?

A) Faith-PLUS is well suited to retrofit. Check the existing duct size and route, confirm the external grille and any backdraught shutter are in good condition, and verify there is space to remove the fascia for cleaning after installation. If reusing a through-wall sleeve, make sure it is sound, correctly pitched to the outside and sealed. Where an intermittent fan is being replaced, remember that continuous dMEV requires a permanent power supply via a local isolator and often benefits from a tweak to the door undercut so make-up air can reach the fan. Commission the background and boost rates to match the room, set the chosen boost trigger and run-on, and enable constant airflow for stable duty. The result is a neat, quiet upgrade that delivers continuous protection against condensation and mould.

Q) What accessories are available to help install the Nuaire Faith-PLUS neatly and compliantly?

A) Dedicated accessories are available to suit different routes and finishes. A window kit provides the purpose-made components required for safe, weather-tight installation through glazing with a professional internal and external finish. A rigid wall plate levels uneven substrates, covers oversize or imperfect cores and gives a clean perimeter detail so the fascia sits square and flush. Colour-matched through-wall kits in various finishes deliver a straightforward 100 mm penetration with a low-resistance external termination and an adjustable wall sleeve for an accurate fit to wall thickness. Selecting the correct accessory simplifies drilling, weatherproofing and alignment, keeps the duct path short and straight, and helps maintain airtightness, which together preserve airflow, quietness and energy efficiency.

Q) How should I troubleshoot if my Nuaire Faith-PLUS seems noisy, weak or fails to boost?

A) Start with simple checks. Clean the fascia and ensure the internal intake and external cowl are free of dust and debris. Confirm the door has a small undercut so replacement air can reach the room. Inspect the duct for kinks, tight bends or crushed sections and reseal any loose joints; a short, straight, airtight route is essential for quiet efficiency. If the fan is rattling, check that the fascia is seated correctly and that the shutter is not catching on a misaligned sleeve. If the unit does not boost when expected, verify the chosen trigger. Lower the humidity set point slightly, extend the run-on timer or confirm that a switch-live feed is present when the room light is on, depending on how you configured control. If the fan will not run, check the local isolator and protective fuse, then ask a qualified electrician to verify the supply and connections.

Q) What day-to-day user guidance should be given after installing a Nuaire Faith-PLUS?

A) Explain that Faith-PLUS runs quietly at a low background rate all the time and will increase speed automatically when moisture is produced or when a boost trigger is used. Daily adjustment is rarely needed and the local isolator should be left on so the fan can protect against condensation and mould continuously. Encourage occupants to keep the fascia clear of dust and obstructions, to use bathroom doors with a small undercut for make-up air, and to let the fan run on after showers or baths if a manual boost is used. Reassure them that night-time delay can be enabled to avoid nuisance boosting during sleeping hours and that routine cleaning is quick and simple due to the filterless, tool-free fascia.

Q) What are the operating conditions and construction details of the Nuaire Faith-PLUS?

A) Faith-PLUS is built with a robust ABS casing suitable for bathrooms and wet rooms, with IPX4 protection when wall mounted. The operating temperature range is typically 0°C to +40°C, covering the conditions encountered in normal dwellings. A high-efficiency DC brushless motor with ball bearings and locked-rotor protection underpins reliable, quiet operation for continuous duty. The mixed-flow impeller provides a good balance of pressure and flow to cope with short duct runs and through-wall routes. Controls are integrated behind a 3-button, 3-digit 7-segment display that governs trickle, boost, timers, humidistat response, night-time delay and constant airflow mode. Recognition in the SAP PCDB, a daily run monitor and a 5-year warranty round out a specification designed for long-term, low-maintenance performance.

Nuaire FAITH-PLUS User Guide

Nuaire FAITH-PLUS Installation Manual

Nuaire FAITH-PLUS Flyer