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Maximum possible length of flue/vent tubing/etc. ?

 
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I was wondering, at maximum, how long can the exiting vent tubing/flue/etc. can be before becoming ineffective due to the air from the heater cooling too much, thus reducing the air flow and either causing the heater system to not function in a necessary or preferred manner, or possibly even causing a hazard to due the air/fumes/smoke stalling or backing up, building up in the interior of a structure...

Thank you.
 
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the answer to this inquiry will help me in my quest as well. thank you
 
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Location: Springdale, WA USA - Cold Mediterranean Climate
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One of their videos indicates they stop at 20 or 30 feet for reliable flow.
 
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