Panasonic FV-GKF32S1 Passive Inlet Vent Provides makeup (outside) air to help balance indoor versus outdoor air pressure Through-the-wall sleeve has 3-Inch diameter and 12-Inch length and fits a 3-Inch wall opening Foam pad reduces outdoor noise and condensation Insulation lining also prevents condensation Durable ABS and PP resin body and includes seven stainless steel installation screws