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    The section the goes into the floor have a...

    The section the goes into the floor have a shutter valve in the main duct coming out of the furnace. I can keep it 1/4 open to reduce the pressure. It seems though that the upper floors don't get...
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    366

    cold outside air penetrating ventilation

    I have a 1969 house in SE Minnesota. The slabs for the basement and one of the ground level rooms were poured over the in floor ventilation. In the ground floor room especially there is cold air...
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