Specification: Type: bypass evaporative Gallons per day: 12 (based on 120° F plenum temperature) Dimensions (inches): 12 1/4 H x 12 W x 8 1/2 D Weight (pounds): 3.5 Vapor Pad replacement: GA10 (GFI #7905) Replace 1-2 times per season For home sizes up to 3,200 square feet Plenum opening (inches): 9 1/8 W x 9 1/8 H Bypass opening (inches): 6 Pallet quantity (units): 36 Installation: warm air / return air plenum / right or left side Control: MHX3C manual-control duct-or-wall mount humidistat Power (volts): 24v Warranty (years): 5yrs Manufacturer Installation KIT Included Features : Maximum Humidity Output Through Low-Profile Cover That Forces Air Directly Through the Vapor Pad at its Warmest Point Stainless steel distributor tube for cold or hot water supply Redesigned cover and chassis to direct hot furnace air directly through the Vapor Pad Reduced Vapor Pad frame for maximum pad exposure Left or right bypass installation option Left or right solenoid valve installation option Easy Maintenance Through Snap-in-Place, Easy Lift-Off Cover Sturdy Two-Piece Vapor Pad Frame That Easily Pulls Apart to Release & Replace the Vapor Pad Your furnace sends warm air through the humidifier and a water-soaked Vapor Pad, evaporating water within the Vapor Pad. Newly-moistened air is then delivered throughout your home via your home's duct system. Breathe Healthier with a GeneralAire 3200 Evaporative Humidifier.