About this item Crawlspace Ventilation Fan: Airflow: 540CFM, Ventilation type: Air out. With this exhaust fan, you can exchange the outdoor and indoor air, improve room air quality and balance the humidity. Use crawl space vent fan used for exhausting vent radon gas treating wood gases and odors, and preventing them from entering into living spaces. IP-55 Rated Built-in Isolation Mesh: ABESTORM ventilation fan features a solid stainless steel shell compared to other ventilation fans, it is more suitable for damp areas and IP55 protection grade has highly dustproof and waterproof performance. With 5.5mm isolation mesh which prevents reptiles from gaining access to the crawl space, this vent fan will reduce moisture indoors to protect the structure of the house and the health of its occupants. Built-in Dehumidistat Freeze Protection Thermostat: The basement ventilation fan operating humidity: is 5%-80%RH, It will turn ON/OFF automatically with a SET humidity % level. This foundation vent fan will help reduce moisture in living spaces and the structure and protect damp areas from condensation and wood rot. Easy to Install Operate: The ventilation fans overall size is 15*10.2*2.8inch, 8.7-inch fan with 6 foot grounded power cord. Our vent fan features a simple knob control panel, easy to set humidity for running. Just plug it in, set it, and forget it. Household ventilation fan-powered crawl space ventilation from low-speed passive ventilation to efficient active ventilation which quickly reduces moisture and humidity. IMPORTANT: All models are equipped with factory pre-installed thermostats to prevent fan operation when outdoor temperatures fall below 35°F. › See more product details