Hi guys, there's a bad draft coming into our house via the extractor fan. I've tried a couple of "Ducting back draught shutters" but they are either too big 5" or too small 4" to fit.
Perfect many thanks for all the help guys. I didn't realise that those Cowled vents had the flap in them as it does really show on the picture. Thats the route to go.
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