Standard Features - For Home Sizes up to 3,000 Sq. Ft. - Included: The MHX3C Manual-Control Duct Mount Humidistat. - 18 GPD (Based on 120 Plenum Temperature). - Vapor Pad replacement number 990-13 (GFI #7002). Replace 1-2 times per season. - 120V. - 19 Lbs. - 5 Year Warranty.