Standard Features - Included: Our MHX3C Manual-Control Duct Mount Humidistat. - For Home Sizes up to 2,800 Sq. Ft. - 17 GPD. - DuraPlast ultra-violet stable automotive grade plastics. - Integral humidity control bypass damper. - Transformer, solenoid valve, Vapor Pad, saddle valve. - Bypass humidifier mounts easily on the warm or return plenum and delivers 17 GPD. - 8 Lbs. - 24V. - 10 Year Warranty. - Replacement Vapor Pad: GA19 (GFI #7919) or 990-13 (GFI #7002). Replace 1-2 times per season.