Exhaust Gas Outlet Pipe Materials; Air Intake Inlet Pipe Vent Materials - lntellihot iQ251D II Operation & Installation Manual

7.8 Exhaust Gas Outlet Pipe Materials

SAFETY
INSTRUCTIONS
For Canadian installations, plastic exhaust gas outlet
piping must comply with CAN/CGA B149.1 and be
certified to the Standard For Type BH Gas Venting
Systems, ULC-S636. Components of this listed system
must not be interchanged with other vent systems
or unlisted pipes or fittings. All plastic components
and specified primers and glues must be from a single
system manufacturer and must not be intermixed with
another system manufacturer's products.
All units come factory installed with 3 inch polypropylene
(PP) venting. The maximum allowable venting distances are
the same regardless of vent material selected.
The materials listed in the tables below outline the acceptable
exhaust gas outlet pipe materials:
United States Exhaust Gas Outlet Pipe Standards
Material
PVC Schedule 40 (ASTM D1785)
Exhaust
CPVC Schedule 40, 80
Gas Outlet
Approved Polypropylene
Pipe
AL29-4C Stainless Steel
Canadian Exhaust Gas Outlet Pipe Standards
Material Description (approved to ULC-S636)**
Type BH Special Gas Vent Class IIA (PVC)
Exhaust
Type BH Special Gas Vent Class IIB (CPVC)
Gas Outlet
Type BH Special Gas Vent Class IIC (Polypropylene)
Pipe
Type BH Special Gas Vent Class I (AL29-4C Stainless Steel)
*Note: Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel
(PPSU - polyphenylsulfone) in nonmetallic venting systems is prohibited.
Covering nonmetallic vent pipe and fittings with thermal insulation is
prohibited.
**Note: The components (pipe, fittings, primers, and glues) must
be from a single manufacturer; do not interchange. Follow the pipe
manufacturer's certified instructions.
SAFETY
INSTRUCTIONS
Do not use cellular foam core pipe to vent exhaust
gases.
This water heater has a built-in exhaust gas outlet temperature
control that limits the exhaust gas temperature to a maximum
of 149°F (65°C) for PVC pipe. In commercial applications,
which require higher water temperatures, exhaust gas
temperature can reach 190°F (88°C) and require materials,
such as polypropylene (PP), stainless steel (SS), or CPVC.
If the temperature approaches the upper limit, the burner
will turn off automatically to protect the vent pipe. Once the
exhaust gas temperature has dropped to a normal operating
level, the unit will automatically restart.
iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections
May 2018 - Revision 01
Description*
If the inlet/return water temperature will exceed 150°F
(66°C), do not use PVC pipe. Follow the display prompts
to set the maximum water temperature for the exhaust gas
outlet pipe material being used.

7.9 Air Intake Inlet Pipe Vent Materials

The air intake inlet pipe can be made of any approved plastic
or metal vent material. ABS, PVC, polypropylene, galvanized
steel, and/or flexible corrugated ducting are all examples.
When using a corrugated material, ensure there is no
inadvertent crimping or blockage to the air intake inlet pipe.
Refer to the table below for a list of approved materials.
United States Vent Pipe Standards
Material
PVC Schedule 40
Air Intake Inlet
CPVC Schedule 80
Pipe
Approved Polypropylene
Canadian Vent Pipe Standards
Material
Type BH Special Gas Vent Class IIA (PVC)
Air Intake Inlet
Type BH Special Gas Vent Class IIB (CPVC)
Pipe
Type BH Special Gas Vent Class IIC (Polypropylene)
Note: In addition to these charts, it is recommended to
consult the most recent edition of ANSI Z223.1/NFPA 54 or
CAN/CGA B149.1, as well as all applicable local codes and
regulations when selecting air intake inlet pipe materials.
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