ANSWERS: 2
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Check your thermostat and make sure that the switch that says "FAN" is in the "AUTO" position. The lack of a filter should not cause cold air to blow through the vents.
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I have something similar, but it is the cold air return in my propane hot air system. The cold air can be really cold in the winter. I wonder if I could block it, it seems like it makes the room a lot colder until the heat kicks back on. I was told that I could not cover the vent for the cold air return.
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