How To Build A Box Around Heater In Attic

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.

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. Install fiberglass batt insulation on top of the foam board. Doing these two things would dramatically reduce the amount of warm air getting into the. This video shows how to build a soffit around ductwork.

Unfortunately my house furnace is located in the attic. There are many different ways to build a soffit but this is definitely my favorite way. 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.

Clean the floor around the attic stairs so the tape will adhere well. Cut a piece of foam the size of the exterior dimensions of the box for the lid. I leave in nh so in the winter time it gets pretty cold up here. Place the box fan face down on a work surface.

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. Build a framing box the length width and depth of the duct you will cover. Tape the lid to the top of the box along one of the long edges with foil tape.

Attach the two layers of foam board together and apply them to the hatch.