AlorAir VentirPro 540S Ventilation Fan The AlorAir VentirPro 540S ventilation fan is built with robust stainless steel construction, boasting an IP-55 rating to resist condensation and rust, ensuring extended durability. Equipped with a barrier screen, it effectively prevents flying insects and reptiles from interfering with the fan's operation. Featuring a built-in dehumidifier to alleviate air humidity and a memory function for automatic startup and shutdown, this fan provides reliable performance in basements, attics, warehouses, and various other settings. Why should we consider installing a crawl space ventilation fan? The perennially enclosed nature of crawl spaces leads to a lack of external air circulation, resulting in the accumulation of moisture within the space. This prolonged moisture fosters the growth of mold and causes wood to deteriorate, thereby compromising its structural integrity. Additionally, damp wood attracts pests such as reptiles, which further exacerbates the damage. Furthermore, airborne spores can infiltrate living spaces through floors, cracks, and even crawl space HVAC systems, leading to indoor air pollution that poses health risks to you and your family. AlorAir's underground ventilation system offers a simple solution to these challenges. By effectively expelling moist and stagnant air from the confined space, the crawl space fan allows fresh air from the outside to enter, facilitating the removal of excess heat, moisture, dust, and odors from various spaces. Whether it's a crawl space, basement, garage, or carpentry workshop, AlorAir's ventilation solution ensures a healthier and more comfortable indoor environment. Specifications Size For 5600 Cu.Ft, 900 Sq.Ft Air flow 540 CFM Power Cord （ft） 6 ft Motor AC Functioning Humidity Range 5%-80% Temperature Range 35-158℉ Dim(L x W x H) 17.7×13.2×5.6 in Weight 6.2 Ibs Sound Pressure Level(dBa) 55 dBA