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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 NFPA
54/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.
pressure (Category IV). Harmful flue gases may leak into the room which can cause serious injury or
death.
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. Only the venting manufactures listed in the table below may be used. 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.
Model
ST2500-ST3000
ST3500-ST4000
ST5000-ST6000
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.
Model
ST2500-ST3000
ST3500-ST4000
ST5000-ST6000
*Requires 14" to 12" reducer 2691000373
Revised: December 8, 2021
Released: December 8, 2021
Do not use a barometric damper if operating with a positive stack
DuraVent
Adapter
Size
Model
10"
810006988
12"
810005274
14"
810009329
Heatfab
Adapter
Size
Model
10"
910510CPVC
12"
912512CPVC
14"
912512CPVC*
Patterson-Kelley 2021
All Rights Reserved.
Technical Service 1.877.728.5351
Heatfab
Adapter
Size
Model
Not Required
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
TM
P-K Storm
Gas Fired Boiler
Page 39
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