How To Build A Box Around Heater In Attic

Researching the web i found some opinions that folks say consider building a large insulated box around the entire furnace leaving an opening at the bottom for combustion air intake.

How to build a box around heater in attic.

Elevate an enclosure in a basement or garage. Use concrete blocks or a concrete pad to set the base of the furnace at least 4 inches above the floor to prevent any water from reaching it. I leave in nh so in the winter time it gets pretty cold up here. Cut out two pieces of rigid foam board that are 1 4 inch smaller than the hatch so homeowners can slide the attic access panel open easily.

Pull the insulation back from the two wires inside the cord. Slit 3 inches in on the cord s outer insulation from the cut end using a utility knife. Install fiberglass batt insulation on top of the foam board. Place the box fan face down on a work surface.

Unfortunately my house furnace is located in the attic. Position the box over the opening making sure it is square. Make the box of 2 by 2 inch lumber with two side ladders with a top and bottom plate and vertical rails in between. Tape the lid to the top of the box along one of the long edges with foil tape.

Build a framing box the length width and depth of the duct you will cover. Cut off the end of the power cord using the blade of a utility knife. Attach the two layers of foam board together and apply them to the hatch. This video shows how to build a soffit around ductwork.

Clean the floor around the attic stairs so the tape will adhere well.