AboutJim Barnhart Expertise Fifty + years in Heating, Ventilating, Air Conditioning, Sheet Metal Manufacturing.
Semi retired since 1995,
Experience Answer questions about , residential and commercial.
Answer questions about sheet metal fabrication.
Fifty years plus experience.
No answers for oil equipment, No answers for kitchen appliances, No answers for laundry appliances.
Question I am extending the return air drop under my furnace so I can add a second return air vent. I see that the existing box is constructed of 2x4s with 5/8 sheetrock on the sides and 2 pieces of 7/16 plywood on top. What so I need to use in the extension? Can I use 1/2 plywood on top if it will not support any weight? I plan to built a workbench which will partially sit on top of this extension.
Answer Gary,
I don't know what your set-up is? Why is your "furnace" sitting up on a constructed "box"
The word furnace to me indicates a "gas fired furnace" is that what you have? You plan to extend the box which way, side, top, back? where will the added return grill be? Is your furnace in a basement?
