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3.4.6 Category IV Installations
If the vent installation is designed for Category IV conditions only (condensing – positive pressure) as it is
defined in ANSI Z21.13/CSA 4.9, latest edition. The installations shall be in accordance with NFPA54/ANSI
Z223.1, the National Fuel Gas Code, or CAN/CSA-B149.1, the Natural Gas and Propane Installation Code, or
applicable provisions of the local building codes.
Do not use a barometric damper if operating with a positive stack pressure
(Category IV). Harmful flue gases may leak into the room which can cause
serious injury or death.
3.4.7 Stainless Steel Venting
The following materials are used by venting manufacturers to produce listed venting systems.
AL29-4C Stainless Steel Vent Systems listed and labeled to UL1738 Venting Systems for Gas-
•
Burning Appliances, Categories II, III, and IV
316L Stainless Steel where certified and warranted by the vent manufacturer for venting of Category
•
II, III or IV appliances
These prefabricated venting systems must be installed according to the manufacturer's installation
instructions. Special care should be taken to ensure that any and all integral gasketing is properly assembled
and creates a gas and water tight seal. Systems that require silicone caulking for gasketing should only be
installed with silicone caulk that is recommended by the vent manufacturer, or if none is recommended, only
high temperature, waterproof, silicone caulk should be used. Support of venting system must be according to
the manufacturer's instructions. The boiler collar shall not be used to support the weight of the vent.
3.4.8 CPVC Vent System Installation
Install CPVC vent systems in accordance with this manual and the SMACNA Thermoplastic Duct
Construction Manual. Install manufactured vent systems in accordance with the manufacturer's listing and
instructions. A customer supplied adapter is required to be installed between the boiler and the CPVC
venting.
Operating Parameters:
Maximum Water Temperature Set Point 180° F
•
Flue Gas Limit 200° F
•
Installation Parameters:
Cement and primer must conform to ASTM F493
•
Three feet of venting closest to the boiler must not be enclosed
•
The vent shall not be insulated
•
CPVC Support Spacing (Feet)
Vent Size
Sch 40
4
4
6
4-1/2
8
5
10
5-1/2
12
6
TM
P-K SONIC
Gas Fired Boiler
T T T T echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
Sch 80
4-1/2
5
5-1/2
6
6-1/2
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