Navien NFC-175 Installation & Operation Manual page 71

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
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Gas Code, ANSI Z223.1/NFPA 54.
Appliance manufacturer's Installation Instructions.
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Regulations on the supervision of construction.
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Statutory provisions.
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Installation and service work must be carried out by licensed
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professionals only.
Risk Guidelines
Ensure that all common vent system components are
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manufactured and installed in accordance with valid standards,
regulations, and safety engineering rules.
To avoid risk, the common vent system must be installed and
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used only for the original purpose described in this manual.
Defects or damages found in a common vent system must be
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addressed and repaired immediately.
For roof or chimney modifications, refer to the relevant industrial
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safety regulations.
Works on roofs and facades are dangerous. Comply with all
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relevant regulations.
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
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straight. Chamfer and deburr all edges before installing the
components.
All vent joints must be fully tightened.
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Before operating the system, ensure that the Installed vent
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system is clean and free of debris.
Ensure that the vent system is rigidly supported according to the
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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
PVC Schedule 40 (Solid Core)
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USA CPVC Schedule 40 or 80 (Solid Core)
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Approved Polypropylene (Centrotherm Innoflue)
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Type BH Special Gas Vent Class IIA (PVC)
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Type BH Special Gas Vent Class IIB (CPVC)
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Canada*
Type BH Special Gas Vent Class IIC
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(Polypropylene/Stainless Steel)
* 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.
Installing a Common Vent System 71