How to fasten air exchanger ducts to unit

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I have an air-exchanger, and the hoses are little loose. That is I can feel the air flowing out between the motor and the hose.

Here is a picture of the overall thing:

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Here is closer picture that shows where the air escapes from exactly:

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How do I make it more air tight?

I see that there is some sort of sticky aluminium foil or something that they used before:

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Maybe that's what I need to use again? If yes, what's it called?

Best Answer

I agree with Michael, and add that you could also use large HVAC zip ties. If the lines seem to come loose easily, then you would be better off using a tape. Now, "Duct" tape and "Duck" tape are not the same. "Duck" tape is what most people see as the old fashion silver/gray colored roll of tape that now comes in wild designs and colors and can be bought at every store that sells tape. "Duct" tape is designed for duct lines, HVAC, and is usually an aluminum foil type tape, and a common brand is 3M.

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