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Horizontal (Category III) venting systems must be installed
in accordance with these instructions.
Maximum Horizontal Vent Length For Stainless Steel Vent
Pipe - 30' Plus One 90º Elbow Plus Vent Terminal.
Minimum Horizontal Vent Length - 2' Plus One 90º Elbow
Vent Termination.
Additional elbows are equivalent to 6 feet of straight pipe
for 4" diameter 90° elbow or 3 feet of straight pipe for 3"
diameter 90° elbow. 2, 3, 4, 5, Section Boilers use 3" vent
pipe; for 6, 7 Section Boilers use 4" vent pipe.
Figure 8 - Induced Draft High Effi ciency Boilers
(21mm/m)
HORIZONTAL VENTING INSTRUCTIONS
INDUCED DRAFT HIGH EFFICIENCY BOILERS
(300mm
CHOICE OF VENT PIPE MATERIAL
• U. L. Listed Z-Flex Z-Vent Stainless Steel Vent Pipe.
• U. L. Listed Heat-Fab Saf-T-Vent Stainless Steel Vent
Pipe.
• U. L. Listed Flex-L Star-34 Stainless Steel Vent Pipe.
• U. L. Listed ProTech Systems FasNSeal Stainless Steel
Vent Pipe.
(21mm/m)
)
13
)
(300mm
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