Furnace Base can, air Plenum 21"x21"x18" (21"x21"x18")

This is very sturdy. I sealed the seams and lined it with duct insulation. Great product.

I recently purchased a Mr Cool 2 to 3 ton heat pump and I was able to get this to fit perfectly. However if you not good with sheet metal this box may not be for you the Pittsburgh edges were a little tough to get aligned and Hammer down. With a little TLC everything fits together nicely and this works great if you plan on stalling a Mr Cool heat pump on your own.

Perfect base for the 21x21 Mr cool furnace. My furnace is set up as downdraft because it’s a manufactured home, so I had to cut a hole in the bottom. It literally fits like it was meant for this furnace. One downfall was that there were no strengthening ridges on the panels so I was worried about hearing it pop when the furnace kicked on. I added those to be safe.

This product is overpriced for what you get. The base did not fit very well although I managed to secure it by installing sheet metal screws on each edge as I went. I am not even convinced it can support a 200 pound furnace. You are far better off to find a local metal shop and have them build it.

This plenum feeds air into an upflow heat pump air mover. The dimensions worked out perfectly for our air mover and securely carries the weight. Assembling it, however, was difficult because the bottom was a bit smaller than the sides. It left gaps that were wider than I expected, but I used mesh and mastic and got a doubly airtight result. Overall very satisfied.