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Keith
Installing Jenn Air Range Hood Wall Vent - Thermal Break
Keith

I'm installing a wall-mount canopy range hood from Jenn Air and for cold weather installations, it states: 

"An additional backdraft damper should be installed to minimize
backward cold airflow and a thermal break should be installed
to minimize conduction of outside temperatures as part of the
vent system. The damper should be on the cold air side of the
thermal break. The break should be as close as possible to where the vent
system enters the heated portion of the house."

I have searched every forum I can find - even called Jenn Air. I've researched for days learning about thermal bridges and even the concept of a thermal break. I've talked to friends of mine, and even prayed to God - but nowhere can I find anyone who has shed light on what a thermal break is made of, looks like, etc.

Everyone clearly states that one is needed, and they even suggest where to install it. But WHAT is it? What material is it? If I have 6" rigid ducting connecting to a wall vent that exits outside, is a thermal break caulking? Foam? Something that wraps around the duct? It can't be this difficult, can it??  
 

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