The TPI Polytechnics Ventum is produced with our unique polyurethane formula which offers very high insulation values. The Ventum is designed to meet with imperial and standard U.S. dimensions. Therefore this air inlet is also easy to use in renovation projects where existing inlets need replacement. With seals on the side of the inner flap and the house air leakage is prevented. The rounded edges on the back of the house considerably reduce resistance. This increases the capacity and improves the air flow. The inner flap is equipped with flanges on the side for an improved throw of air during minimum ventilation.