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Old 06-22-2014, 10:03 AM   #61
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Upgrade from Dinosaur to Heat Pump


I don't know and would have to see it. I have some flex pipe for my HRV which is basically a plastic inner pipe with coil spring wire and covered by 1/2" insulation and a plastic wrapper. That is all I know of flex pipe as attic units are rare where I am. Even then we use metal duct and cover it with that foil insulation in the pic I put earlier. Check HDepot as they may have some foil insulation otherwise you can go to a HVAC shop or commercial HVAC company and they may sell you some for cash. HDepot has that silver duct tape. I would try get some of that stuff in the pic and use as wide as pieces as I could to have less joints to seal. You may have to buy a cheap pair of straight cut sheet metal snips from HDepot also to cut thru the foil.

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Old 06-22-2014, 10:42 AM   #62
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Yuri: I see on some articles that a length of the insulation you were talking about is ran lengthwise on top of the metal vent run (although it doesn't show what to do around the floor vents) and another length run along the bottom of the metal vent run and held up by a string bridge stapled to the joists. I suspect this can be done, using foil tape like you were talking about to tape up the seam on each side. I thought about maybe nailing a thin plywood cover along the joists where each vent run is, but I am afraid if I do any bit of moisture that might somehow happen to condense will be trapped by the wood.
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Old 06-22-2014, 10:50 AM   #63
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one other quick question, please, and I will leave you alone. My floor vents are currently 4" X 8". AC guy said these are plenty big enough to deliver the air. Would it help to make them 4" X 12"?
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Old 06-22-2014, 10:59 AM   #64
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I may have confused you there. I mean the supply vents from each main vent trunk. The vents coming into the room are 4 x 8". Each main vent trunk (2 of them) is 12" wide by 6" deep.
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Old 06-22-2014, 11:08 AM   #65
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Don't worry you are not bothering me/us. Beenthere is your duct sizing/vent sizing man and may be able to help. Do whatever it takes to attach it. I would not be worried about a bit of water getting on wood. Wood have to be lots for it to rot and it is outside and under the trailer anyway.
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Old 06-24-2014, 09:43 PM   #66
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Done deal. Cost me $6,600.00. And they wanted another $250.00 to move the recirculating vent from where they put it. I told them I'd do it myself. I will also be insulating the metal ductwork myself.

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