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I had to put mine on the return side. I went to the local sheet metal shop and had a new piece built with a rack for the hx and filter for 50 bucks. My furnace fan quit after about a month and I was worried because of the hx being on return. I had to go down and spin the fan by hand and then push the button and it would run. Every 3 hrs. For 3-4 days till my furnace guy could get here, kinda felt like going down to stoke the old wood stove. Ended up needing a new jumpstart pack, at least the best I can describe it. Booster to help the fan get started. All is good now.