If your house is a typical tightly-built modern home, you need an Air Supply Ventilator (ASV). If you have a kitchen fan, a bathroom fan, or a dryer vent, you need an ASV. If you
have a fireplace, a woodstove, or vent-free gas, you need an ASV. In short, all American homes would benefit from installing one or more ASVs.
Not so long ago, new houses were built without soffit vents, ridge vents, o…