Install fiberglass batt insulation on top of the foam board.
How to build a box around heater in attic.
This video shows how to build a soffit around ductwork.
Slit 3 inches in on the cord s outer insulation from the cut end using a utility knife.
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.
There are many different ways to build a soffit but this is definitely my favorite way.
Unfortunately my house furnace is located in the attic.
Doing these two things would dramatically reduce the amount of warm air getting into the.
Elevate an enclosure in a basement or garage.
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.
Attach the two layers of foam board together and apply them to the hatch.
Make the box of 2 by 2 inch lumber with two side ladders with a top and bottom plate and vertical rails in between.
Cut off the end of the power cord using the blade of a utility knife.
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.
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.
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.
Pull the insulation back from the two wires inside the cord.