SoffitFlow 4" Soffit Vent

Help Protect Attics From Dangerous Mold & Mildew Standard soffit vents dump humid air right where passive intake vents pull it back into the attic. SoffitFlow's patented design extends beyond the roofline, breaking the recirculation cycle that creates callback complaints and warranty issues. The Tailpipe Principle Vehicle exhaust systems don't terminate under the engine bay because engineers understand airflow dynamics. SoffitFlow applies this same principle to residential exhaust systems, extending the termination point beyond the fascia to prevent recirculation. Performance Engineering SoffitFlow's design addresses the fundamental flaw in traditional soffit terminations. The precision-positioned 4-inch collar works with a V-shaped tapered bottom panel to maximize airflow velocity. The extended nose projects beyond the fascia line, creating a positive pressure zone that prevents humid air from deflecting back toward intake vents. The integrated gravity-assist damper operates at 50+ CFM—compatible with standard residential bath fans. An engineered weep hole prevents condensation accumulation, while the hinged wildlife grill provides maintenance access without compromising performance. Built for Professional Installation Standards High-density polyethylene (HDPE) construction provides superior performance across temperature extremes from -40°F to 150°F. Unlike standard ABS or PVC terminations, HDPE maintains structural integrity through thermal cycling while resisting UV degradation and chemical exposure from industrial cleaning products. The material's low moisture absorption rate makes it ideal for coastal and high-humidity applications where traditional materials fail. HDPE's thermal stability prevents damper warping, ensuring consistent operation throughout the product lifecycle.