Standard Features - For Home Sizes up to 2,800 Sq. Ft. - Included: The MHX3C Manual-Control Humidistat. - Replacement Vapor Pad number 990-13 (GFI #7002). Replace 1-2 times per season. - It fits as small as 8.5" ducts and delivers 17 GPD (Based on 120 Plenum Temperature). - 17 GPD (Based on 120 plenum temperature). - 24V. - 8 Lbs. - 5-Year Warranty.