Tamarack Insulated Whole House Fan - 1150 CFM, 70 Watts, Model# HV1000 Energy efficient whole house fan cools the indoor air in your whole house! Energy Efficient R-38 Insulated, Easy Installation, 1000 CFM for up to 1000 sf floor area Fits 16 or 24 On Center Joists - No Joist Cutting Needed 3 Year Limited Warranty, Assembled in the USA, Title 24 Compliant Horizontal or Vertical Installation, UL Listed