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Hey thanks! Don’t know how I missed that - single wall to double wall being ok. Much appreciated!

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...