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I'm working on a mobile home with a neg. the pressure inside the home. Someone insulated the mobile home too much and now have a neg. the pressure inside when the furnace, bath fan and range hood are tested at the same time. The furnace is fairly new with an intake vent connected to the outside When all the things are going it brings in furnace fumes. I want to bring in makeup air somehow. I thought I would install an 8" duct with a hood on the outside and an inline damper inside it, not the kind that goes on a furnace tee but it's inline that you can adjust. But the owner is afraid that it will bring in cold air when the wind blows outside. Any recommendations will be taken. email me for more info. [email protected]