This Crawlspace Vent Fan with a powerful airflow of 220 CFM, it efficiently expels moisture and stale air from damp areas. Measuring 18" x 9" x 2", the fan comes with dual fans and a 6.56-foot grounded power cord, ensuring easy installation and operation. It features a built-in humidistat with a humidity adjustment range of 20% - 80% RH, which can intelligently monitor and control the environmental humidity. Additionally, it exhausts radon gas, treated wood gases, and odors, preventing these harmful substances from spreading into living areas. The fan is also equipped with a freeze protection thermostat. When the outdoor temperature drops below 35°F, the fan automatically stops running to ensure equipment safety. The knob control panel is straightforward to use, allowing users to easily set the operating time. Its wide range of applications includes crawl spaces, basements, attics, garages, hydroponic environments, and planting tents. By enhancing air circulation. Color: Silver. Material: Aluminum.