5. Blauberg UK Extractor Fan Telescopic Wall Ventilation Duct Sleeve with Cowled Grille Shutter 100mm (White) Read Review. Blauberg UK. Check Price. 6. Ducting Cowled Gravity Flap 150mm / 6" Outlet Cowl Air Vent Grille with Non Return Valve / Backdraft Shutter KO150-30 Read Review. Awenta. Check Price.. Yep polystyrene works. Do the same myself in the bathroom in the winter, all that lovely heat was just disappearing out of the fan. If you can put a scrunched up bit of bubble-wrap in the hole it will make a big difference.. Then wedge a piece of plaster board on top, apply some PVA and then plaster over it when you have the time or inclination..

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BigDaveUK Member. I've had a new extractor fan fitted to the en-suite and it's one way valve thing is flapping /banging in the breeze like an old cat flap/letterbox (note breeze not high winds) and keeping us awake. it's an xpelair simply silent (yeh right) contour c4. Can anyone recommend one that doesn't to this.. I glued the plastic to the top and 2 sides of the grille and left a ''skirt'' of about 2". when the extractor is on, the air flow comes out through the bottom 'hole'. when the wind blows, it blows the plastic onto the grille. I have had no wind problems since!! always on the look out for something to make it look better but be as effective.