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I have an insulated duct like this: https://www.homedepot.com/p/Master-Flow-4-in-x-12-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD4X144/203420974

The actual tube inside is some kind of plastic. When attaching this to a metal duct, do I seal it with metal tape or duct tape? Or should I use those metal collars that can be tightened with a screw?

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    plastic flex duct is about the worst product you can use for ducting. Is this for a bathroom fan? Nov 7, 2023 at 18:00
  • For future reference: "metal collars that can be tightened with a screw" is commonly called a "hose clamp" or "duct clamp". In the UK, they're called "Jubilee clips". May have other names elsewhere in the world.
    – FreeMan
    Nov 7, 2023 at 19:31

2 Answers 2

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Use a strap-type duct clamp.

Duct tape has no modern HVAC application that I'm aware of. Metal foil tape is a seal, not a fastener, as it tears easily.

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This is literally what duct tape was invented for.

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