Can 2 propane gas room heaters be vented into a common flue? Both are gravity units, not induced draft. Both have 3" vents, and would be installed on the same level in a residential structure. The plan is to vent the smaller unit higher up in the 3" flue, with this common 3" flue feeding upward into, and terminating in, an existing 6" stainless steel (Metalbestos) flue, which goes through the roof. All joints/connections to be sealed and screwed in place. Will this installation meet code requirements for common venting?

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