PreVent-It Soffit Vents 4 Inch - Only Design that Prevents Moist Air from Re-entering Home, Under Eave Exterior Vents for Bathroom Exhaust Fan, Screws Included, White, 4-Pack

Patented design and the only soffit vent engineered to direct moist bathroom air away from the soffit, not beneath it. This helps prevent several problems, such as water and roof damage, elevated moisture leading to higher heating and cooling expenses, and indoor air quality concerns that can affect health. Scientifically demonstrated to displace the greatest volume of exhausted air away from the residence (over 95% of moist air). Avoid compromising your family's well-being or your home's condition by installing a less efficient, inexpensive soffit vent. The damper/flap creates a sealed system that stops pests and air from entering the home. The small front grill openings assist in boosting air speed to push moisture over the soffit edge. Note: Intended for bath fans up to 110 CFM. Fans with higher CFM may produce louder noise and experience reduced air flow. Simple to install; easy to clean via the removable screen; accommodates a 4-inch vent hose (4 screws included). Constructed from durable, weather-resistant resin plastic; made in the USA