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Air Vents

These gravity shutter air vents from Knightsbridge suit 100mm extractor fans, fitting standard 4 inch ducting runs in kitchens, bathrooms and utility spaces. The polycarbonate shutters sit closed when the fan is off, then open under airflow to push stale air out and help keep draughts and insects from drifting back in. Choose white to blend with a render or matt black for darker walls.

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Venting an extractor fan

An extractor fan needs somewhere for the air to go, and a gravity shutter vent handles that exit point on the outside wall. These vents suit 100mm extractor fans and fit standard 4 inch ducting runs, which makes them a straightforward match for the fans found in many homes when stale, damp air needs moving out of a room. They give the duct a tidy, finished outlet rather than a raw opening through the wall.

How the shutters work

The polycarbonate shutters sit closed while the fan is switched off, then open under the airflow the moment it runs. This pushes stale air out of the room, and when the fan stops the shutters simply drop back shut again. It is a simple mechanism with no power of its own, working off the movement of the air alone, which means there is nothing extra to wire in or maintain over time.

Keeping draughts and insects out

Because the shutters close on their own when the fan is idle, they help keep cold draughts from blowing back through the duct into the room and make it much harder for insects to drift inside. That closed resting position is the main advantage over a plain open grille, keeping the run sealed neatly between uses rather than leaving a permanent gap.

Where they fit

These vents suit kitchens, bathrooms and utility spaces, which are the rooms where extractor fans do the most work clearing away steam, moisture and cooking smells. Anywhere you happen to be running a 100mm fan to standard ducting, a gravity shutter gives that moving air a clean and tidy way out through the wall.

Two finishes

There is a choice of finish to suit the wall it sits on. White blends in against render or lighter painted walls, while matt black sits far more discreetly against darker surfaces. Pick whichever disappears best where the vent comes through. Free UK delivery over £99, worldwide shipping.

Frequently Asked Questions

What size fan do these vents suit?
They suit 100mm extractor fans and fit standard 4 inch ducting runs, which makes them a common match for the fans found in many homes.

How does a gravity shutter vent work?
The polycarbonate shutters sit closed while the fan is off, then open under the airflow once it runs to push stale air out. When the fan stops, the shutters drop back shut on their own, with no power needed.

Do these vents help with draughts and insects?
Yes. Because the shutters close when the fan is idle, they help keep cold draughts from blowing back through the duct and make it harder for insects to drift inside between uses.

Where are these vents typically used?
They suit kitchens, bathrooms and utility spaces, where extractor fans do the most work clearing steam and cooking smells. A white or matt black finish lets the vent blend in with the wall.

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