Nuaire CYFAN Window Mounting Kit

Health & Safety Considerations

Work on glazing presents specific risks. Glass edges are sharp and panes can shatter if stressed; always wear cut-resistant gloves, eye protection and suitable footwear. Never attempt to cut toughened/tempered glass, this must be factory-cut before toughening. Laminated glass requires specialist tooling and a competent glazier.

Support the sash securely while the pane is removed or while work is carried out on site. Handle seals and plastics gently; do not use solvent cleaners on rubbers. If the window is above ground level, provide safe access and fall protection. Treat all electrical circuits as live until isolated, and route the fan’s flex to avoid entrapment in moving parts of the window.

Site Preparation

Confirm the window construction (single, double or laminated glazing) and thickness, and ensure it sits within the kit’s stated thickness range. Choose a position that allows an unobstructed discharge to outside and will not clash with handles, restrictors, trickle vents, blinds or curtain tracks.

The usual location is high on the pane, away from the locking stile, with enough clearance to remove the fan cover for cleaning. Plan an internal cable route from the fan to a local isolator without creating trip hazards or pinching the flex in the sash. Agree with a competent glazier how the 125mm circular aperture will be produced and how the pane will be safely deglazed/reglazed if required.

Clean the glazing area thoroughly so the seals seat on a grease-free surface, and check you have all kit components and fixings to hand before starting.

Limitations And Good Practice

Use the kit only with a compatible Nuaire Cyfan fan and within the stated glazing thickness limits. Do not attempt installation on cracked or damaged panes, on panes with embedded wiring/films at the cut line, or on rooflights that cannot be made weather-tight around the assembly.

Avoid siting where external rainwater streams across the opening unchecked; a modest top-edge drip line on the frame above the hole can help shed water. Maintain a short, straight discharge path; do not add extra ducting between the fan and the glass kit.

Tighten fixings evenly and progressively to avoid point-loading the pane. Always keep the inner and outer seals clean and correctly orientated to prevent draughts and water ingress. Provide an internal door undercut or transfer path so makeup air can reach the room when the fan runs.

Step-By-Step Installation

1. Make The Area Safe: Isolate the electrical circuit the fan will use. Provide a stable work platform at the window, clear the sill and surrounding area, and protect finishes with dust sheets.
   
   

2. Cut Or Procure The Glass Aperture: Engage a competent glazier to form a clean 125mm circular hole in the chosen position and to deglaze/reglaze the sash if the pane must be removed. Inspect the cut edge; it should be smooth and free of chips that could propagate cracks.
   
   

3. Prepare The Seals And Clamping Rings: Lay out the inner and outer clamping rings and the compressible seals (‘O’-rings or gaskets). Lightly wipe the glass around the aperture with a non-solvent cleaner and allow to dry. Fit the seals to the rings as instructed so they will bear evenly on the glass.
   
   

4. Offer The Outer Assembly To The Pane: From outside (or from the exterior-facing side), present the outer clamping ring centrally to the hole, ensuring its seal sits flat and undistorted on the glass. Hold it temporarily in place or have an assistant support it.
   
   

5. Fit The Inner Assembly And Align: From inside, offer the matching inner clamping ring to the hole. Align any orientation marks so the fixing holes register correctly and the fan body will sit level.
   
   

6. Insert And Tighten Fixings Progressively: Insert the supplied screws through the inner ring and engage them with the outer ring. Tighten each screw a few turns in a diagonal sequence, then repeat around the set so compression builds evenly. Do not over-tighten; aim for firm, uniform seal compression without bowing the rings or stressing the glass.
   
   

7. Fit The Backdraught Shutter If Provided: Locate the shutter cartridge in the designated recess on the room side of the assembly so the flaps open to exhaust air and close under gravity when the fan is off. Check for free movement.
   
   

8. Mount The Fan Body: Present the Cyfan to the inner ring, push fully home onto the locating features and secure as directed. Ensure the fan impeller is unobstructed and that the body sits square without rocking.
   
   

9. Route And Secure The Power Cable: Dress the flex so it leaves the fan clear of moving window parts and cannot be trapped by the sash. Provide a drip loop on the interior run if practical, then secure the cable neatly with clips.
   
   

10. Fit The Internal And External Trims: Snap or screw the cosmetic covers into place, ensuring no seal is displaced and the airflow path remains clear. From outside, check the external face is tight to the glass with an unbroken seal line.
    
    

11. Make The Electrical Connection And Commission: Ask a qualified electrician to connect the fan to a suitably rated isolator, restore power and commission the fan’s settings (background/boost rates, humidity response or timer) to suit the room.
    
    

12. Prove Operation And Finish: With the room door slightly ajar, verify that the fan exhausts strongly and that no air leaks or rattles are apparent around the glazing. From outside, check for steady discharge and confirm the shutter closes when the fan stops. Clean fingerprints from the glass and record the installation date for your records.

Troubleshooting

If air leakage or draughts are felt around the kit, inspect the seal line inside and out; loosen the fixings slightly, re-seat the rings so the seals are fully supported on clean glass, then re-tighten evenly.

If vibration or buzzing occurs, check that the clamping screws are tightened uniformly and that the fan body is fully engaged on its mount without touching the glass; a slight re-position and even torque usually cures resonance.

If the shutter chatters or does not close, confirm it is oriented correctly and free from seal interference.

If water ingress is noted after heavy rain, look for debris trapped under the external seal, confirm the rings are square, and verify the window drains are functioning; refit and re-compress the seals if needed.

If the fan does not run, check the local isolator and protective device, then ask the electrician to verify supply and settings. Should boost not engage as expected, review the control choice (switch-live, humidistat or other) and confirm the commissioning values are appropriate for the room’s moisture load.

Q) What is the Nuaire Cyfan Window Mounting Kit and why would I choose it instead of a through-wall installation?

A) The Nuaire Cyfan Window Mounting Kit (CYFAN-WKIT) is the purpose-made, through-glass installation kit for the Nuaire Cyfan extract fan. It enables you to fix the fan securely into a 125mm circular cut-out in a window pane using paired inner and outer clamping rings with compressible ‘O’-ring seals, creating a weather-tight, draught-free finish. You would choose the Nuaire Cyfan Window Mounting Kit where coring an external wall is impractical or undesirable—typical scenarios include flats with restricted façade access, heritage brickwork you do not wish to disturb, soffits or services blocking a direct route, or very short internal wall returns that make a neat sleeve impossible. A window installation keeps the discharge path short and straight, which reduces system resistance and helps the Cyfan’s centrifugal impeller deliver the commissioned airflow with less noise. Because the kit fixes to the glass rather than the frame, there is no need to drill the sash, and the fan can be removed later for cleaning without upsetting the glazing. Used correctly, the CYFAN-WKIT provides a quick, professional route to outside for bathrooms, WCs, utilities and compact kitchens while preserving both performance and appearance.

Q) What comes in the Nuaire Cyfan Window Mounting Kit and how does each part contribute to a reliable installation?

A) The Nuaire Cyfan Window Mounting Kit is supplied as a complete set so you are not hunting for sundries on site. The core components are the inner and outer clamping rings that sandwich the glass evenly around the 125mm aperture, keeping the fan body square and stable. Each ring accepts a moulded cover so the installation looks neat from inside and outside. Between the rings and the pane are compressible sealing ‘O’-rings (or gaskets) that create a continuous barrier to rain and draughts once the fixings are tightened progressively. A dedicated backdraught shutter is included and fits on the room side of the assembly; its flaps open on extract and fall closed when the fan stops to limit cold air return and odour ingress. The screw pack and spring elements are sized to the kit so clamp force is distributed without point-loading the glass. Together, these parts deliver a robust, low-resistance through-glass termination tailored to the Cyfan fan, preserving performance while allowing the fan to be removed for cleaning without disturbing the glazing or seal line.

Q) Which windows can take the Nuaire Cyfan Window Mounting Kit and what should I know about glass types and thickness?

A) The Nuaire Cyfan Window Mounting Kit is designed for typical residential glazing and is specified for a stated thickness range covering common single and double-glazed panes. Always confirm the pane thickness against the kit’s technical data before ordering. Cutting the 125mm circular hole must be carried out by a competent glazier. Toughened (tempered) glass cannot be cut after toughening; the hole must be factory-cut before the pane is toughened. Laminated glass requires specialist tooling and technique to avoid delamination and should be handled only by an experienced glazier. The kit clamps to the glass itself, not the frame, so there is no sash drilling; however, the pane must be sound, free of cracks and free of embedded wiring or films at the cut line. The usual position is high on the pane, away from handles, restrictors and trickle vents, with space to remove the fan cover for cleaning. Where units are part of a sealed double-glazed assembly, the glazier will advise on safe deglazing/reglazing, sealing and any manufacturer warranty implications before the aperture is produced.

Q) Is the Nuaire Cyfan Window Mounting Kit compatible with all Cyfan models and spigot sizes?

A) The Nuaire Cyfan Window Mounting Kit is purpose-designed for the Nuaire Cyfan centrifugal fan and uses a direct 125mm through-glass aperture to maintain a short, low-resistance discharge path. Cyfan is supplied with both 100mm and 125mm outlets for wall or ducted installs, but when you use the window kit you are not adding ducting; instead, the fan seats into the clamped 125mm opening and exhausts directly to atmosphere. This preserves the Cyfan’s pressure capability and helps achieve the commissioned l/s at lower noise. The kit is not a universal adaptor and should not be used with other brands or with fans that rely on different fixing geometries. Electrical configuration is independent of the window kit: whether you run Cyfan from a standard mains supply via its internal electronics or configure it as SELV 24V with the remote transformer, the CYFAN-WKIT remains the same. Always follow the Cyfan installation guide for window mounting, as the safety interlock and cover engagement must operate correctly once the fan is seated in the glass assembly.

Q) Where should I position the Nuaire Cyfan Window Mounting Kit on the pane for best performance and comfort?

A) Good positioning makes the most of the Cyfan’s performance while keeping the room comfortable. Aim for a high location on the pane so rising moist air is captured efficiently, and keep clear of handles, restrictors, blinds and curtain tracks so the fan cover can be removed for cleaning. Avoid clashing with trickle vents and do not obstruct the glazing beads or drainage paths. Choose a spot that discharges directly to free air; do not vent into enclosed cavities or behind external cladding. Internally, plan a tidy cable route to a local isolator so the flex is not trapped by the sash or draped across walkways. In bathrooms and WCs, ensure the siting respects electrical zones and that any SELV transformer (if used) is mounted outside splash zones. Finally, think about make-up air: a modest undercut on the door or an adjacent transfer path allows replacement air to enter when the fan runs, lowering noise and helping the Cyfan maintain its commissioned airflow with less effort and fewer draught sensations.

Q) How do I install the Nuaire Cyfan Window Mounting Kit and what are the key steps to get right first time?

A) Installation is straightforward once a competent glazier has produced the clean 125mm circular aperture. With the pane cleaned and safely supported, present the outer clamping ring to the exterior face, ensuring its seal sits flat and undistorted. From inside, align the inner ring so the fixing holes register correctly, then insert the kit screws and tighten them progressively in a diagonal sequence to build even compression around the seals—avoid over-tightening, which can bow the rings or stress the glass. Fit the supplied backdraught shutter on the room side and check it moves freely. Offer the Cyfan body to the inner ring, push fully home on the locating features, and secure per the fan’s instructions so the safety interlock and cover seat correctly. Dress the supply flex so it cannot be pinched by the sash and create a small drip loop on the interior run if possible. Snap on the cosmetic trims, check the external seal line is unbroken, then ask a qualified electrician to make the connection, commission trickle/boost or humidity response, and prove steady discharge with the door slightly ajar.

Q) How does a window installation with the Nuaire Cyfan Window Mounting Kit affect airflow and noise compared with a wall sleeve?

A) A well-executed window installation often improves real-world performance because the 125mm through-glass aperture creates a very short, straight discharge path with minimal pressure drop. Lower resistance means the Cyfan’s centrifugal impeller operates nearer its sweet spot, so the fan delivers the commissioned litres per second more quietly than it might through longer or rougher duct routes. The included backdraught shutter helps limit cold return when the fan is off without adding significant resistance during operation. As with any installation, acoustics depend on detail: even ring compression, a clean, undistorted seal, a square, well-seated fan body and a clear external face all reduce turbulence and resonance. If you experience buzzing or ring-rattle, relax the fixings slightly, re-seat the seals and re-tighten evenly in sequence. Because the path is direct to outside, airborne sound to the exterior is also straightforward; choosing a sheltered pane position and keeping the external face flush to the glass helps the airflow leave smoothly, reducing whistling in blustery conditions.

Q) What safety and compliance points apply when using the Nuaire Cyfan Window Mounting Kit?

A) Safety begins with the glazing: only a competent glazier should cut the 125mm hole, and toughened glass must be factory-cut before toughening. Laminated panes need specialist technique to avoid delamination. Handle all glass with cut-resistant gloves and eye protection, support sashes securely during works, and provide safe access and fall protection for upper-storey windows. Electrically, isolate the fan circuit at a suitably rated local spur, route the flex so it cannot be trapped by window movement, and observe bathroom electrical zones; use the Cyfan’s SELV 24V configuration where additional separation is required. Do not use solvent cleaners on the kit’s rubber seals, do not mount on cracked or damaged panes, and avoid locations where rainwater sheets continuously across the opening without a drip path. The Nuaire Cyfan Window Mounting Kit is intended only for use with the Cyfan fan and within the specified glazing thickness; it is not a universal adaptor. On completion, prove operation, check for leaks and ensure the backdraught shutter closes freely when the fan stops.

Q) How do I maintain a Nuaire Cyfan fitted with the Window Mounting Kit and what routine checks should I plan?

A) Routine care is simple and helps preserve performance and appearance. Isolate power at the local spur, then remove the Cyfan’s push-fit cover and wash it in warm soapy water, rinse and dry. Gently vacuum the impeller and interior with a soft brush, taking care not to disturb sensors. Wipe the inner ring and visible seal with a damp cloth—avoid solvents on rubbers. From outside, wipe the moulded trim and check the external seal line is unbroken and clean of grit so it remains weather-tight. Confirm the backdraught shutter opens freely on extract and closes under gravity when the fan stops. Verify the fixings are snug and evenly tightened; do not overtighten into the glass. Ensure the supply flex is secure and clear of sash movement, with no signs of pinching. Restore power and confirm that background and boost settings still suit the household’s routine and that humidity-led response, if enabled, raises duty promptly after steamy events. Periodic checks during electrical inspections keep airflow and acoustics consistent over the long term.

Q) What troubleshooting tips apply to the Nuaire Cyfan Window Mounting Kit if I notice draughts, noise or poor performance?

A) If you feel draughts around the assembly, inspect both inner and outer seal lines; loosen the fixings slightly, re-seat the rings so the seals lie flat on clean glass, then re-tighten evenly in a diagonal sequence to restore uniform compression. For vibration or buzzing, ensure the fan body is fully home on its mount and not touching the rings, and that the fixings are snug but not over-tightened (over-compression can bow a ring and cause resonance). If the shutter chatters or does not close, check orientation and that no seal or trim fouls the flaps. In heavy rain, any ingress usually points to debris on the external seal or uneven clamp—clean, re-seat and re-compress. Weak airflow often traces to a blocked cover or external face, a closed door without an undercut restricting make-up air, or conservative commissioning; clean the faces, provide a transfer path and increase the set airflow slightly. If the fan will not run, check the local isolator and protective device, then ask a qualified electrician to verify supply and the chosen boost/trigger configuration.

CYFAN W-KIT Installation & Maintenance