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100mm Extractor Fan with Overrun Timer and Humidistat - White

£5099
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Description

This Knightsbridge 100mm extractor fan combines an adjustable overrun timer with an integrated humidistat, running at 9.7W on 230V mains to extract 87m³/hr through a 102mm wall or ceiling aperture. The humidistat detects excess moisture and activates the fan automatically when humidity exceeds preset thresholds of 60%, 70%, 80% or 90% RH, while the overrun timer continues extraction for 1, 5, 15 or 30 minutes after the fan is switched off or humidity drops back to normal levels.

Designed for bathrooms, ensuites, utility rooms and WCs where condensation control is needed, the fan sits flush to the wall or ceiling with a 49.9mm frontal projection and 78.5mm recessed depth behind the surface. The IP45 rating allows installation in bathroom Zone 1, meaning it can be fitted above a bath or within shower enclosures at 2.25m height or above. The ABS casing is double-insulated and does not require an earth connection, simplifying the wiring run from a switched fused spur or ceiling pull-cord.

A built-in backdraught shutter closes when the fan is not running, preventing cold air ingress and heat loss through the duct. At 28.5dBA measured at 3 metres, the fan runs quieter than most domestic refrigerators, making it suitable for late-night use in homes where noise transmission between rooms is a concern. The white ABS faceplate matches standard UK bathroom fittings and the fan is Part F and Part L Building Regulations compliant, meeting the minimum continuous mechanical extraction requirements for new-build and renovation projects.

Specification
Height 157.6mm
Width 157.6mm
Depth 127.2mm
Projection 49.9mm
Recessed Depth 78.5mm
Cut-out Diameter 102mm
Construction ABS
Finish White
IP Rating IP45
Class II
Primary Voltage 230V 50Hz
Earth Terminal No
Noise Levels 28.5 - 30dB @ 3m
Airflow Airflow: 24l/s [86.93m3/hr]
SFP 0.401W / (l/s)
Humidistat function Interval functions: 4/8/12/24hrs Humidity levels: 60/70/80/90%RH
Overrun Timer Overrun timer settings: 1/5/15/30mins
Warranty 3 Year Guarantee
Downloads

Product Specification Sheet

Frequently Asked

How does the humidistat function work?

The integrated humidistat monitors relative humidity and activates the fan when levels exceed your chosen threshold: 60%, 70%, 80% or 90% RH. You can also set interval functions for 4, 8, 12 or 24 hours to control how frequently the fan checks humidity levels. Once humidity drops back below the threshold, the overrun timer continues extraction for the set duration.

What size aperture is needed for installation?

The fan requires a 102mm diameter circular aperture in the wall or ceiling. The total recessed depth behind the surface is 78.5mm, so check that your wall or ceiling cavity can accommodate this depth. The frontal faceplate projects 49.9mm once fitted.

Is it suitable for bathroom Zone 1?

Yes. The IP45 rating allows installation in bathroom Zone 1, which covers areas above baths and within shower enclosures at 2.25m height or above. The fan is double-insulated and does not require an earth connection.

How quiet is the fan?

At 28.5dBA measured at 3 metres, the fan runs quieter than most domestic refrigerators and is suitable for overnight use in homes where noise transmission between rooms is a concern. The ABS casing and motor mount design reduce vibration transfer to the wall or ceiling structure.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    This Knightsbridge 100mm extractor fan combines an adjustable overrun timer with an integrated humidistat, running at 9.7W on 230V mains to extract 87m³/hr through a 102mm wall or ceiling aperture. The humidistat detects excess moisture and activates the fan automatically when humidity exceeds preset thresholds of 60%, 70%, 80% or 90% RH, while the overrun timer continues extraction for 1, 5, 15 or 30 minutes after the fan is switched off or humidity drops back to normal levels.

    Designed for bathrooms, ensuites, utility rooms and WCs where condensation control is needed, the fan sits flush to the wall or ceiling with a 49.9mm frontal projection and 78.5mm recessed depth behind the surface. The IP45 rating allows installation in bathroom Zone 1, meaning it can be fitted above a bath or within shower enclosures at 2.25m height or above. The ABS casing is double-insulated and does not require an earth connection, simplifying the wiring run from a switched fused spur or ceiling pull-cord.

    A built-in backdraught shutter closes when the fan is not running, preventing cold air ingress and heat loss through the duct. At 28.5dBA measured at 3 metres, the fan runs quieter than most domestic refrigerators, making it suitable for late-night use in homes where noise transmission between rooms is a concern. The white ABS faceplate matches standard UK bathroom fittings and the fan is Part F and Part L Building Regulations compliant, meeting the minimum continuous mechanical extraction requirements for new-build and renovation projects.

    Specification
    Height 157.6mm
    Width 157.6mm
    Depth 127.2mm
    Projection 49.9mm
    Recessed Depth 78.5mm
    Cut-out Diameter 102mm
    Construction ABS
    Finish White
    IP Rating IP45
    Class II
    Primary Voltage 230V 50Hz
    Earth Terminal No
    Noise Levels 28.5 - 30dB @ 3m
    Airflow Airflow: 24l/s [86.93m3/hr]
    SFP 0.401W / (l/s)
    Humidistat function Interval functions: 4/8/12/24hrs Humidity levels: 60/70/80/90%RH
    Overrun Timer Overrun timer settings: 1/5/15/30mins
    Warranty 3 Year Guarantee
    Downloads

    Product Specification Sheet

    Frequently Asked

    How does the humidistat function work?

    The integrated humidistat monitors relative humidity and activates the fan when levels exceed your chosen threshold: 60%, 70%, 80% or 90% RH. You can also set interval functions for 4, 8, 12 or 24 hours to control how frequently the fan checks humidity levels. Once humidity drops back below the threshold, the overrun timer continues extraction for the set duration.

    What size aperture is needed for installation?

    The fan requires a 102mm diameter circular aperture in the wall or ceiling. The total recessed depth behind the surface is 78.5mm, so check that your wall or ceiling cavity can accommodate this depth. The frontal faceplate projects 49.9mm once fitted.

    Is it suitable for bathroom Zone 1?

    Yes. The IP45 rating allows installation in bathroom Zone 1, which covers areas above baths and within shower enclosures at 2.25m height or above. The fan is double-insulated and does not require an earth connection.

    How quiet is the fan?

    At 28.5dBA measured at 3 metres, the fan runs quieter than most domestic refrigerators and is suitable for overnight use in homes where noise transmission between rooms is a concern. The ABS casing and motor mount design reduce vibration transfer to the wall or ceiling structure.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.