Hey that's a good idea, Tom!!! Thanks!
I think that the cooling hoses will need to be trimmed also, Bob. I eyed the ones from the I/H outlet pipes & they look close but no way to tell without lining them up on the hoses that are there.
Bob, on the trimming operation. I screwed a piece of hardwood down to my work bench for a flat level surface to work from. I had some oak 1" x 12" fragments laying about. I used a floor square to do lenght measurements and marking with painter's tape on either side of my marks. I know that this is not correct saftey but if you peirce the duct and then pull the utility knife towards you slowly you won't get wounded. I bury the knife to the hilt and to the slope of the nose. Stuff cuts easily enough with minor pulling on the knife. I'm not saying that it isn't a PIA by no means! My first cut took a wave because I didn't use the tape on both sides...but I only did a 1/4" wide trim just to get a feel for the material & method. I did another 1/4" too fix the wave...it isn't perfect I'm sure but it looks straight to the eye...after I did the two pieces of tape to give me my guide line. Second method worked much better, with the two tape method. Just like the commercial painters use the tape trick when they stripe a building's basement walls...3" stripe uses three strips of tape & pull the middle tape off and paint that area & that's your stripe.
Tom