Tjernlund V2D Model UnderAire Crawl Space Fan Ventilator, Deluxe 2 Fan, 220 CFM, Model: V2D, Outdoor & Hardware Store Power ventilate musty, damp crawl spaces through existing passive vents Faceplate is sized for ventilation openings through standard block foundations 220 CFM, 40 watt maintenance free exhaust fans Includes adjustable dehumidistat, freeze protection limit and 6 foot grounded power cord Faceplate can be trimmed to match non-standard foundation openings