[Crawlspace & Basement & Garage & Attic 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 to change your crawl space from low-speed passive ventilation to efficient active ventilation.

[Built-in Dehumidistat & Freeze Protection Thermostat] Operating humidity: 5%-80%RH, this High-Flow Powered Ventilator Fan will turn ON/OFF automatically with SET humidity % level. Auto stop working when the outdoor temperature is lower than 35°F/3°C. This vent fan will help reduce moisture in crawl space / foundation / basement to protect the structure of the house and the health of its occupants.

[Built-in Isolation Mesh & IP-55 Rated] 5.5mm Isolation Mesh prevents reptiles from gaining access to the crawl space; Solid-Built Aluminum Zinc Shell with IP-55 rating, highly resistant to liquids and dust, higher weather-proof, makes it ideal for work in a humid environment with a long service life, don't worry it rust. Maintenance free crawlspace fan helps increase air circulation to protect damp areas from condensation and wood rot.

[Easy to Install & Operate Vent Fan] Overall Size: 15"x 2.8" x 10.2", 8.7 inch fan with 6 foot grounded power cord. Faceplate can be trimmed to meet your different installation needs. Features simply knob control panel, easy to set humidity for running. Just plug it in, set it and forget it. Constant operation helps vent radon gas, treated wood gases and unpleasant odors, prevents seeping into living space.

[Quality Service and Warranty, Buy Worry-free] Abestorm crawlspace ventilation fan is fully compliant with electrical safety ETL. Every Abestorm crawl space fan comes with a 2-year warranty. Moreover, we established a professional technical support communication center. You can call us directly, ready to assist you.

[IMPORTANT] All models are equipped with factory pre-installed thermostats to prevent fan operation when outdoor temperatures fall below 35°F.