The 4" intake flange is great for small cold frames up to 20' x 96'.  Exchanges air in a 100 cu. ft. room in 2 minutes. 

Features:

• Flange type : 3 hole round


• Motor HP: 1/40 th


• Amperage Draw: 0.93
  

Hydrofarm is the nation's oldest and largest manufacturer of hydroponics equipment and grow lights. You can find their products in hundreds of stores and catalogs across North America. Hydrofarm Quality: Their systems incorporate only premium quality components, and the professional-grade hydroponics and UL-listed lighting fixtures will give you years of dependable service. Hydrofarm Reputation: On the market since 1977, Hydrofarm brand products are the choice of more indoor gardeners and gardening retailers than all other brands combined.