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100mm Extractor Fan With Overrun Timer - Black

£3999
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Description

The Knightsbridge EX1TBK is a 100mm (4-inch) extractor fan in black ABS with an adjustable overrun timer preset to 2 minutes and an adjustable range of 2-30 minutes. Rated at 24 l/s (87m³/hr) extraction, it operates at 28.5-30dBA at 3 metres, making it one of the quieter options for bathroom, ensuite and utility ventilation where continuous operation or post-shower moisture extraction is needed without intrusive noise.

Designed for wall and ceiling installation in Zone 1 (IP45 rating), the fan fits a 102mm cut-out and has a 49.9mm projection from the wall once fitted, with 78.5mm recessed depth behind the mounting surface. The built-in back draft shutter closes when the fan is off, reducing cold air ingress through short ducting runs. The overrun timer continues to extract after the light or pull-cord switch is turned off, clearing residual moisture without needing to leave the switch on manually.

The black finish provides a low-visibility alternative to white in dark-tiled bathrooms, utility rooms and commercial washrooms. The ABS construction is double-insulated (Class II), so no earth terminal is required during installation. The fan complies with Building Regulations Part F (ventilation rates) and Part L (energy efficiency) at 0.404W/l/s SFP, making it a compliant choice for new-build and retrofit projects requiring certified extraction.

Specification
Height 157.6mm
Width 157.6mm
Depth 127.2mm
Projection 49.9mm
Recessed Depth 78.5mm
Cut-out Diameter 102mm
Construction ABS
Finish Black
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)
Overrun Timer Overrun timer settings: 2-30mins (Preset: 2mins)
Warranty 3 Year Guarantee
Downloads

Product Specification Sheet

Frequently Asked

How does the overrun timer work?

The fan connects to a switched live (typically the bathroom light switch or a separate pull-cord). When the switch is turned on, the fan runs immediately. When the switch is turned off, the timer keeps the fan running for a preset period (default 2 minutes, adjustable 2-30 minutes) before it stops. This clears residual moisture without needing to leave the switch on manually.

Is it suitable for use in a bathroom shower area?

Yes. The IP45 rating allows installation in Zone 1 (directly above a bath or shower enclosure), provided the fan is installed according to wiring regulations and at the correct mounting height. It is not suitable for Zone 0 (inside a shower cubicle or bath).

How quiet is it in practice?

At 28.5-30dBA at 3 metres, the EX1TBK is quieter than most extractor fans in the 100mm class, which typically run at 35-40dBA. In a typical domestic bathroom, the noise is comparable to a quiet refrigerator hum rather than the louder whirr of standard extraction fans.

Does it need to be earthed?

No. The fan is double-insulated (Class II), so it does not require an earth terminal. You need only a permanent live, a switched live (for the overrun timer control), and a neutral connection.

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

    The Knightsbridge EX1TBK is a 100mm (4-inch) extractor fan in black ABS with an adjustable overrun timer preset to 2 minutes and an adjustable range of 2-30 minutes. Rated at 24 l/s (87m³/hr) extraction, it operates at 28.5-30dBA at 3 metres, making it one of the quieter options for bathroom, ensuite and utility ventilation where continuous operation or post-shower moisture extraction is needed without intrusive noise.

    Designed for wall and ceiling installation in Zone 1 (IP45 rating), the fan fits a 102mm cut-out and has a 49.9mm projection from the wall once fitted, with 78.5mm recessed depth behind the mounting surface. The built-in back draft shutter closes when the fan is off, reducing cold air ingress through short ducting runs. The overrun timer continues to extract after the light or pull-cord switch is turned off, clearing residual moisture without needing to leave the switch on manually.

    The black finish provides a low-visibility alternative to white in dark-tiled bathrooms, utility rooms and commercial washrooms. The ABS construction is double-insulated (Class II), so no earth terminal is required during installation. The fan complies with Building Regulations Part F (ventilation rates) and Part L (energy efficiency) at 0.404W/l/s SFP, making it a compliant choice for new-build and retrofit projects requiring certified extraction.

    Specification
    Height 157.6mm
    Width 157.6mm
    Depth 127.2mm
    Projection 49.9mm
    Recessed Depth 78.5mm
    Cut-out Diameter 102mm
    Construction ABS
    Finish Black
    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)
    Overrun Timer Overrun timer settings: 2-30mins (Preset: 2mins)
    Warranty 3 Year Guarantee
    Downloads

    Product Specification Sheet

    Frequently Asked

    How does the overrun timer work?

    The fan connects to a switched live (typically the bathroom light switch or a separate pull-cord). When the switch is turned on, the fan runs immediately. When the switch is turned off, the timer keeps the fan running for a preset period (default 2 minutes, adjustable 2-30 minutes) before it stops. This clears residual moisture without needing to leave the switch on manually.

    Is it suitable for use in a bathroom shower area?

    Yes. The IP45 rating allows installation in Zone 1 (directly above a bath or shower enclosure), provided the fan is installed according to wiring regulations and at the correct mounting height. It is not suitable for Zone 0 (inside a shower cubicle or bath).

    How quiet is it in practice?

    At 28.5-30dBA at 3 metres, the EX1TBK is quieter than most extractor fans in the 100mm class, which typically run at 35-40dBA. In a typical domestic bathroom, the noise is comparable to a quiet refrigerator hum rather than the louder whirr of standard extraction fans.

    Does it need to be earthed?

    No. The fan is double-insulated (Class II), so it does not require an earth terminal. You need only a permanent live, a switched live (for the overrun timer control), and a neutral connection.

    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.