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Combustion
Air Supply
Exhaust
Configuration
Heater Venting
Category
Certified
Materials
Combustion Air
Inlet Material
Vertical Natural
Draft Venting
I “B” Vent
From Inside Building
(Non-Direct Venting)
Horizontal Through-
the-Wall Venting
III
Stainless Steel
(Gas Tight)
Vertical Natural
Draft Venting
I “B” Vent
From Outside Building
(Direct Venting)
Horizontal Through-
the-Wall Venting
III
Stainless Steel
(Gas Tight)
Galvanized Steel
PVC
ABS
CPVC
Support of Vent Stack
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Vent Terminal Location
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Table M: Venting Category Requirements