AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL
– VENT & COMBUSTION AIR PIPING
OMM-0100_E
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GF-146
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11/15/2019
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(800) 526-0288
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6.3 Min/Max Allowable Combustion Air and Vent Piping Lengths
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The
maximum
length of the two pipes vent system is 120 equivalent feet (air intake plus
flue exhaust). However, each single pipe can’t be longer than 60 feet.
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Each 45° elbow inserted in the venting system has a loss of pressure equivalent to 3 feet of
linear pipe.
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Each 90° elbow inserted in the venting system has a loss of pressure equivalent to 6 feet of
linear pipe.
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The
minimum
length of the venting system is 1 foot (357 mm).
6.4 General Venting and Combustion Air Piping Installation
The unit must be vented and supplied with combustion and ventilation air as described in this
section. Ensure the vent and air piping and the combustion air supply comply with these
instructions regarding vent system, air system, and combustion air quality. Inspect finished vent
and air piping thoroughly to ensure all are airtight and comply with the instructions provided and
with all requirements of all applicable codes.
WARNING!
Failure to provide a properly installed vent and air system will cause severe personal injury or
death.
Using vent materials other than those listed in Table 6-1, failure to properly seal all seams
and joints, mixing of venting materials, or failure to follow vent pipe and fittings
manufacturer’s instructions can result in injury, death or property damage.
Table 6-1: Approved Venting Materials
6.5 Specific Vent Installations
Choose acceptable combustion air inlet pipe materials from the following list:
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PVC, CPVC or ABS
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Polypropylene material to be sealed to specification of its manufacturer.
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AL29-4C, stainless steel material to be sealed to specification of its manufacturer. If
using stainless steel, refer to section 6.5.1.
