• Portable Crawl Space Fan
• Air is exhausted  through a 10” duct and out a 8”x16” foundation vent
• Moves air from the crawlspace to outside the crawlspace  
• Frame made of durable ABS plastic
• The frame and base easily slips apart for entrance into crawl space
• Equipped with a 9’ cord
• Has a three speed controller and uses 115 volts
• No costly electrician needed!
• Meets OSHA standards
• Has an OHSA approved grill around the fan blades
• Motors are energy efficient and totally enclosed for moisture areas
• Has a corrosion resistant frame
• Humidistat, rain detector, thermostat and weather station sold separately SEE Catagory "FAN CONTROLLERS" 
• Stands 22" tall when assembled
• Houses a 12" fan  

http://www.youtube.com/watch?feature=player_detailpage&v=cDzBX9u9Oi0