I enjoyed your documention. Thanks for sharing
I don't have the Cheap Heat but did move my Vacuum forward about 2 1/2 inch by replacing the little wooden frame with a 1x4 frame. This allows the 6 inch flex duct that was pinched shut to be replace with 24 inches of 6 inch metal duct. I estimate I gained more than 20 % furance efficency in eliminating 2 crushed flex duct.
Clay 2016 MS 38PS3/Dallas
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