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Installing Jenn Air Range Hood Wall Vent - Thermal Break

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??  

Re: Installing Jenn Air Range Hood Wall Vent - Thermal Break

I have nothing to offer but am about to relate to your frustration.  Our kitchen is being remodeled and we are installing an 1100CFM blower in the attic.  I need to run the 10" ducting to the kitchen, hook up the blower, and vent it through to the outside (through wall or roof).  None of this seems complicated at all, but there doesnt seem to be any good place to go to get the few simple answers that one needs to do this sort of work themselves.  Please report back if you find out what a thermal break is!

Re: Installing Jenn Air Range Hood Wall Vent - Thermal Break

A thermal break is nothing more than a short section of duct that cannot transfer cold temperature. Most of the higher quality ones have rubber groments on both sides. Hence, a thermal break. Cold will not pass over the rubber. The thermal break is to be placed as close to the outside as possible. You also want to ensure that the entire linear duct is insulated. Some of the lower quality pieces have spring loaded dampners. I like the motorized dampners myself. They open when the electric motor is turned on. With all the debris that is going thru the duct, the springs will be loaded with debris in a short period of time. With the motor controlled dampners, you can remove that section and clean it annually. That is an approximation of course. It depends on how often you cook. I installed two motorized thermal breaks in our 16 inch duct. I also installed the blower motor on the outside of the house. Makes very little noise inside. I also installed a couple pieces of rubber duct on each side of the blower motor duct. That controls vibrations noise. I installed the rubber anti-vibration duct on both sides of the duct hangers. Our vent is 8 feet long and 3 feet wide. It is whisper quiet.


Handy Andy In Mt Airy NC

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