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100mm Extractor Fan Vent with Flyscreen - White

£599
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Knightsbridge 100mm extractor fan vent is a white polycarbonate louvered grille with an integral flyscreen, designed to terminate 100mm (4-inch) round ducting runs on internal or external walls. The vent accepts both rigid and flexible duct connections and sits flush against brickwork, blockwork or cavity walls once the 100mm circular aperture is cut.

Designed for kitchens, bathrooms, utility rooms and other spaces requiring mechanical ventilation to the outside, the vent pairs with standard 100mm axial extractor fans and inline duct fans. The louvered design allows air to exit while the mesh screen behind the louvers prevents insects, debris and larger airborne particles from entering the duct when the fan is not running. The front grille is removable, allowing access to clean the flyscreen without disconnecting the duct.

The 152mm square faceplate projects 16mm from the wall surface once installed, with a recessed depth of 48mm behind the wall to accommodate the duct connection spigot. The white polycarbonate construction resists UV degradation and moisture, making it suitable for both sheltered external walls and high-humidity internal installations. The material is lighter and more impact-resistant than metal grilles of equivalent size.

Specification
Height 152 mm
Width 152 mm
Projection 16 mm
Recessed Depth 48 mm
Cut-out Diameter 100 mm
Construction Polycarbonate
Finish White
Warranty 1
Downloads

Product Specification Sheet

Frequently Asked

What size hole is needed in the wall?

A 100mm (4-inch) circular aperture is required. This is the standard size for 100mm ducting termination and matches the cut-out diameter for most 4-inch extractor fans.

Can it be used on external walls?

Yes. The polycarbonate construction resists UV and moisture, making it suitable for sheltered external walls. The louvered design helps shed rainwater, though the vent should not be installed where it will face direct driving rain without an overhang or cowl.

Is the flyscreen removable for cleaning?

The front grille is removable, which provides access to the flyscreen mesh. This allows the screen to be cleaned without disconnecting the ducting behind the wall.

Does it work with flexible ducting?

Yes. The vent accepts both rigid and flexible 100mm round ducting. The spigot on the back of the grille is designed to accept a push-fit connection from standard 4-inch duct.

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 100mm extractor fan vent is a white polycarbonate louvered grille with an integral flyscreen, designed to terminate 100mm (4-inch) round ducting runs on internal or external walls. The vent accepts both rigid and flexible duct connections and sits flush against brickwork, blockwork or cavity walls once the 100mm circular aperture is cut.

    Designed for kitchens, bathrooms, utility rooms and other spaces requiring mechanical ventilation to the outside, the vent pairs with standard 100mm axial extractor fans and inline duct fans. The louvered design allows air to exit while the mesh screen behind the louvers prevents insects, debris and larger airborne particles from entering the duct when the fan is not running. The front grille is removable, allowing access to clean the flyscreen without disconnecting the duct.

    The 152mm square faceplate projects 16mm from the wall surface once installed, with a recessed depth of 48mm behind the wall to accommodate the duct connection spigot. The white polycarbonate construction resists UV degradation and moisture, making it suitable for both sheltered external walls and high-humidity internal installations. The material is lighter and more impact-resistant than metal grilles of equivalent size.

    Specification
    Height 152 mm
    Width 152 mm
    Projection 16 mm
    Recessed Depth 48 mm
    Cut-out Diameter 100 mm
    Construction Polycarbonate
    Finish White
    Warranty 1
    Downloads

    Product Specification Sheet

    Frequently Asked

    What size hole is needed in the wall?

    A 100mm (4-inch) circular aperture is required. This is the standard size for 100mm ducting termination and matches the cut-out diameter for most 4-inch extractor fans.

    Can it be used on external walls?

    Yes. The polycarbonate construction resists UV and moisture, making it suitable for sheltered external walls. The louvered design helps shed rainwater, though the vent should not be installed where it will face direct driving rain without an overhang or cowl.

    Is the flyscreen removable for cleaning?

    The front grille is removable, which provides access to the flyscreen mesh. This allows the screen to be cleaned without disconnecting the ducting behind the wall.

    Does it work with flexible ducting?

    Yes. The vent accepts both rigid and flexible 100mm round ducting. The spigot on the back of the grille is designed to accept a push-fit connection from standard 4-inch duct.

    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.