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BobVila.com > Channels > HVAC > All Tips > Bathroom Fan Insulation Bathroom fan fixtures can poke into the attic insulation and create a pathway for air leaks. Caulk around them from below with high-temperature flexible caulk. Related Showrooms PexSupply.com - Your Online Source for PEX Plumbing & Radiant Heating Supplies Sears - Heating & Cooling Repair SprayFoamDirect.com - Do It Yourself Spray Foam Insulation RadiantGUARD.com - Research & buy radiant barrier and save energy |