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Step 7Install the duct boot
The exhaust needs somewhere to go once it leaves the hood. I used a "universal" duct boot, even though it was a bit too big, to mate the rectangular hood exhaust to a circular flexible duct. For some reason, the so-called hardware store I went to had boots for 4" or 5" ducts, but only sold 3" and 6" flexible ducts... go figure. Rather than try somewhere else, I got the 4" boot and 3" duct and planned on forcing it to work, dammit. Wrong. I ended up having to replace it in the end. Get a 4" (100mm) duct, minimum.
Tape the boot to the hood around the entire perimeter, then double it all to make sure there are no leaks. If you're worried about it coming loose, you could punch a hole through both flange and boot and secure them with sheet metal screws first. I left the duct tape as both sealant and structural member.
Tape the boot to the hood around the entire perimeter, then double it all to make sure there are no leaks. If you're worried about it coming loose, you could punch a hole through both flange and boot and secure them with sheet metal screws first. I left the duct tape as both sealant and structural member.
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