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Installing a Common Vent System
Cutting and Assembling Common Vent
System Components
Standard tools are suitable for the cutting and
assembly of common vent system components.
Follow the guidelines listed below when working
with the components.
●
When cutting vent components, ensure that the
cuts are straight. Chamfer and deburr all edges
before installing the components.
●
All vent joints must be fully tightened.
●
Before operating the system, ensure that the
Installed vent system is clean and free of debris.
●
Ensure that the vent system is rigidly supported
according to the manual’s instructions.
Selecting Vent Pipe Materials
Consult the following chart or the most recent
edition of ANSI Z223.1/NFPA 54, as well as all
applicable local codes and regulations when
selecting vent pipe materials. This appliance
should be vented with materials approved for
Category IV gas appliances. Do not use cellular
core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) for the exhaust vent. See below
for recommended vent materials.
Locale
Recommended Vent Materials
USA
●
PVC Schedule 40 (Solid Core)
●
CPVC Schedule 40 or 80 (Solid Core)
●
Approved Polypropylene
(Centrotherm Innoflue)
Canada*
ULC-S636 Type BH Special Gas Vent
●
Class IIA (PVC)
●
Class IIB (CPVC)
●
Class IIC (Centrotherm Innoflue/
Approved Stainless Steel)
(Refer to page 63)
* For installation in Canada, field-supplied plastic vent
piping must comply with CAN/CGA B149.1 (latest edition)
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 of the certified vent system
must be from a single system manufacturer and must not
be intermixed with another system manufacturer’s parts.
The supplied vent connector and vent termination are
certified as part of the boiler.
Clean, Debris and Chemical-free
Combustion Air
●
Do not install the boiler in areas where dust and
debris may accumulate or where hair sprays,
spray detergents, chlorine, or similar chemicals
are used.
●
Do not install the boiler in areas where gasoline or
other flammables are used or stored.
●
Ensure that combustible materials are stored
away from the boiler and that hanging laundry or
similar items do not obstruct access to the boiler
or its venting.
General and Local Standards
Information
When installing and operating the common vent
system, the following standards and regulations
must be complied with and adhered to:
●
Local codes or, in the absence of local codes, the
National Fuel Gas Code, ANSI Z223.1/NFPA 54.
●
Appliance manufacturer’s Installation Instructions.
●
Regulations on the supervision of construction.
●
Statutory provisions.
●
Installation and service work must be carried out
by licensed professionals only.
Risk Guidelines
●
Ensure that all common vent system components
are manufactured and installed in accordance
with valid standards, regulations, and safety
engineering rules.
●
To avoid risk, the common vent system must be
installed and used only for the original purpose
described in this manual.
●
Defects or damages found in a common
vent system must be addressed and repaired
immediately.
●
For roof or chimney modifications, refer to the
relevant industrial safety regulations.
●
Works on roofs and facades are dangerous.
Comply with all relevant regulations.
Summary of Contents for NFB-175H
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