I've started to install a Hot Dawg 30,000 Btu heater in my shop. I'll be venting it horizontally. I understand I need category 3 vent pipe and my overall vent run will be 48" (26" from heater to exterior wall, thru a 6" thick wall and 16" sticking out the wall). I'd like to use double wall for safety but here is my question. Do really have to buy one continuous 48" run of the double wall Cat3 vent pipe? The manual says "under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipe". Do read that to mean one double wall pipe 48' long , not two 24" pipes? Best price i can find for 3"x48" Double Wall Cat3 is $209 and its on back order.
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Hot Dawg venting
- Thread starter zoar
- Start date
Hmmmm...I put in horizontal cat 3 and definitely joined it, as I used a 45 degree piece along with the pipe out of the heater and then the pipe out the wall. So I definitely have joints. This was expensive stuff (Z-vent) and has internal special o-ring type seals.
You can run single wall stainless anywhere you are 6" or more from combustibles. You should only need to run double wall pipe through the wall and perhaps under a soffit. Sounds to me like you need a piece of double wall about 18"-24" to get through the wall and some single wall for each end.
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Hey thanks! Don’t know how I missed that - single wall to double wall being ok. Much appreciated!You can run single wall stainless anywhere you are 6" or more from comustables. You should only need to run double wall pipe throught the wall and perhaps under a soffit. Sounds to me like you need a piece of double wall about 18"-24" to get through the wall and some single wall for each end.