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They sell, “dual wall” pipes, that we use in the hvac industry that is used for exhaust on furnaces, that would suffice, tape doesn’t do anything other then retain heat. Just seal gaps with it. The dual wall has an inner and outer layer, outer layer is cool to touch. Use an in-line fan to “ pull from your plenum box. They also sell condensate pumps, 110v that will pump out your water condensates, very low amps so power consumption is low. It’s actually very clean water that “can” be used to water plants with.would u take that 3m and put it on ever inch of pipe that will hold that heat I got a new floor ac and having lots of piping and its crazy hot
Seems like alot of unnecessary work just let the hot air vent into the garage /room.This is a DIY in building an exhaust box to use a window shaker a.c. unit indoors.
Tools needed
-box material. I used R max R matte +3
good for up to 250*f and is 3.2r value
- sharp knife
tape measure
3m hvac tape (don't use duct tape)
Little common sense
6" flex duct joiner/sleeve piece
6" 90* elbow
Hose for drip tube
after you mount your a.c. and like it's final position, it's time to build your exhaust box. I made my box with 2 layers of material for added protection. Build 1 section at a time. Fully secure at each spot. I personally do 3 layers of tape (overlapping each other like a brick wall for support). See pics below for details. I use a 6" duct joiner/sleeve
Mounted on top where I attached my insulated flex duct to for the exhaust part. I did 2 layers of the board material. This gives me a 6.4 R value. Noise is barely heard as well. There is no heat on the boards, donuts insulated well.
I will also build a shelf support under the bottom of the exhaust box just for added support. Only thing that's holding it is 3m hvac tape. But it's secured very well.
Pictures will.help more than my description, I'm sure.
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