NTI TRX II Series Installation Quick Manual page 10

STEP 2 Installing
6.2
Intake Air and Exhaust Vent Materials
CAUTION
This boiler is certified as a "Category IV" appliance and requires a special venting system. The vent system will operate with
a positive pressure in the pipe. Exhaust gases must be piped directly outdoors using the vent materials and rules outlined in
the installation manual.
Do not connect vent connectors serving appliances vented by natural draft into any portion of mechanical draft systems
operating under positive pressure.
Follow the venting instructions carefully. Failure to do so will result in substantial property damage, severe personal injury,
or death.
1. Installation should be made in accordance with the regulations of the Authority Having
Jurisdiction, local code authorities, and utility companies which pertain to this type of
water heating equipment.
2. Install the venting system in accordance with these instructions and with the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, CAN/CGA B149, and / or applicable provisions of
local building codes.
3. This boiler must be vented with materials, components, and systems listed and
approved for Category IV appliances. Consult the following chart and the most recent
edition of ANSI Z223.1/NFPA 54, CAN/CGA B149, and / or applicable provisions of local
building codes when selecting vent pipe materials.
DO NOT use cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) for the exhaust vent.
Item
Pipe and Fittings Approved for Intake ONLY
Pipe Approved for
Intake OR Exhaust Vent
Table 5 - Approved Materials for Exhaust Vent and Intake Pipe
*ABS may be used for air intake applications ONLY.
Contact the venting material manufacturer if there is any question about the applicability of the proposed venting material.
Failure to follow these directions will result in substantial property damage, severe personal injury, or death.
10
Material
ABS*
PVC Schedule 40/80
PVC-DWV Schedule 40/80
CPVC Schedule 40/80
Polypropylene
Stainless Steel AL29-4C
Standards for Installation In:
United States
ANSI/ASTM D2661
UL-1738 or ANSI/ASTM D1785
UL-1738 or ANSI/ASTM D2665
UL-1738 or ANSI/ASTM F441
UL-1738 or ULC-S636
Certified for Category IV and Direct Vent Appliance Venting
Canada
ANSI/ASTM D2661
UL-1738 or ULC-S636
420019002000 - Rev. 06 - 1 10324