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Noticed we have cold air coming down the vent when it's not on, is this to do with the holes at the sides or possibly some other cause? : r/homeimprovementideas
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Amazon.com: SNWGPLY Vent Duct Cover, Roof Ventilator, Round Soffit Air Vent, 70mm, Low Flux Prevents Cold Air from Entering, Suitable for Bathroom Or Kitchen Exhaust Fans, Hydroponic Fans, in-line Exhaust Fans :
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