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100mm Gravity Shutter Black - 4 Inch Extractor Fan Vent

£399
The RRP is the manufacturer's recommended retail price of the item.
180 In Stock - Ready to Ship
We are an Independent UK Company
Price match. Found it cheaper? Contact us
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Description

The Knightsbridge 100mm gravity shutter is a black polycarbonate vent cover with three internal louvres that open under airflow and close by gravity when the extractor fan stops. Designed for installation on both internal and external walls, the shutter accepts 100mm rigid or flexible round ducting from standard 4-inch extractor fans.

When fitted to an external wall, the shutter prevents rain penetration and backdraught air from entering the ducting when the fan is off. The gravity-closed louvres also block vermin and windblown debris from accessing the duct run. In internal wall applications, the shutter acts as a one-way valve that allows extracted air to pass through to a plenum or adjacent space while preventing reverse flow when the fan is not running.

The 152mm square faceplate fixes directly to brickwork or masonry using screw fixings through the four corner mounting points. The 22mm recessed depth allows the shutter to sit partially into the wall opening, while the 38mm projection gives clearance for the louvre mechanism. The polycarbonate construction resists UV degradation in external installations and tolerates typical condensation in bathroom and kitchen ducting without corroding.

Specification
Height 152 mm
Width 152 mm
Projection 38 mm
Recessed Depth 22 mm
Cut-out Diameter 105 mm
Construction Polycarbonate
Finish Black
Warranty 1
Downloads

Product Specification Sheet

Frequently Asked

What size wall opening is needed?

The cut-out diameter is 105mm to accept standard 100mm ducting with a slight tolerance. The 152mm square faceplate then covers the opening and fixes to the surrounding wall surface.

Does the shutter require power to operate?

No. The louvres open passively under the airflow from the extractor fan and close by gravity when the fan stops. No electrical connection to the shutter itself is needed.

Can it be used on an external wall exposed to weather?

Yes. The polycarbonate construction resists UV degradation and the gravity louvres are designed to seal against rain penetration when closed. The shutter is specifically intended for external wall installation in typical UK weather conditions.

How is it cleaned?

Wipe the external louvres with a damp cloth to remove dust and debris. For internal ducting condensation buildup, disconnect the ducting from the rear and rinse the louvre mechanism with warm water, then allow to dry fully before reinstalling.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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Free delivery on orders over £99, in the UK and worldwide. Easy returns within 14 days, subject to our returns policy. Full manufacturer warranty included.

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    Description

    The Knightsbridge 100mm gravity shutter is a black polycarbonate vent cover with three internal louvres that open under airflow and close by gravity when the extractor fan stops. Designed for installation on both internal and external walls, the shutter accepts 100mm rigid or flexible round ducting from standard 4-inch extractor fans.

    When fitted to an external wall, the shutter prevents rain penetration and backdraught air from entering the ducting when the fan is off. The gravity-closed louvres also block vermin and windblown debris from accessing the duct run. In internal wall applications, the shutter acts as a one-way valve that allows extracted air to pass through to a plenum or adjacent space while preventing reverse flow when the fan is not running.

    The 152mm square faceplate fixes directly to brickwork or masonry using screw fixings through the four corner mounting points. The 22mm recessed depth allows the shutter to sit partially into the wall opening, while the 38mm projection gives clearance for the louvre mechanism. The polycarbonate construction resists UV degradation in external installations and tolerates typical condensation in bathroom and kitchen ducting without corroding.

    Specification
    Height 152 mm
    Width 152 mm
    Projection 38 mm
    Recessed Depth 22 mm
    Cut-out Diameter 105 mm
    Construction Polycarbonate
    Finish Black
    Warranty 1
    Downloads

    Product Specification Sheet

    Frequently Asked

    What size wall opening is needed?

    The cut-out diameter is 105mm to accept standard 100mm ducting with a slight tolerance. The 152mm square faceplate then covers the opening and fixes to the surrounding wall surface.

    Does the shutter require power to operate?

    No. The louvres open passively under the airflow from the extractor fan and close by gravity when the fan stops. No electrical connection to the shutter itself is needed.

    Can it be used on an external wall exposed to weather?

    Yes. The polycarbonate construction resists UV degradation and the gravity louvres are designed to seal against rain penetration when closed. The shutter is specifically intended for external wall installation in typical UK weather conditions.

    How is it cleaned?

    Wipe the external louvres with a damp cloth to remove dust and debris. For internal ducting condensation buildup, disconnect the ducting from the rear and rinse the louvre mechanism with warm water, then allow to dry fully before reinstalling.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.