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, or other means for house-wide ventilation. Today architects, contractors, and intelligent homeowners realize that proper ventilation is a necessary component for personal health and a healthy home. By bringing fresh filtered make-up air into your house from outside, the ASV ensures that your fireplace or woodstove operates efficiently, with no smoke leakage. The ASV is made of tough ABS polymer. Outside air enters the ventilator through a louvered grill, which provides protection from rain. Insects and vermin are excluded by a separate screen located directly behind the grill. Air flows into your house through a tube inside the ASV that can be cut to fit any wall thickness up to 14 inches. A manually operated damper controls the airflow, with settings ranging from fully closed to fully open, or any volume flow in between. If desired, you can dictate a constant minimum airflow by popping out an optional plug built into the damper. Air passes through a filter before entering the room. The ASV’s filter captures dust and is removable for cleaning. The filter also helps block outside noise. If you suffer from asthma or seasonal allergies, optional filters are available that remove pollens and other very fine particulates from the air before it enters your home. The ASV comes complete with hardware and caulking for installation. The dust filter is standard, and the pollen filter or hi-tech filter may be ordered separately. Tools and saws necessary to install are not included.