A.O. Smith ATX-199 Instruction Manual page 26

Approved Category IV, Single Wall, Venting Suppliers
and Part Numbers
Description
Vent Kits
100112550 2NVHTC43S
100112551
100112552 2NVHTC44S
100112553 2NVHTC44S
-
100112412
ing
100112411
100112410
100112409
Firestop support 100112408
COMMON DIRECT VENTING REQUIREMENTS
Z-FLEX®
Heater Nova
Z-VENT™
VENT™
2SVSHTC43S
2NVHTC43 2SVSHTC43
2SVSHTC04S
2SVSHTC04
2NVFF4 2SVSSCF04
2NVAF4 2SVSADJF04
2NVSC4 2SVSLSF04
2NVSS41 2SVSWS04
2NVFS4 2SVSFSSF04
ULC-S636
UL 1738 or ULC-S636
COMMON DIRECT-VENTING SYSTEM
the National Fuel Gas Code ANSI Z223.1/NFPA 54
B149.1 Natural Gas and Propane Installation
Code (Current Editions)
Only the (A/S/M) TX-199 models can
be common-vented together. Different
models cannot be common-vented.
Failure to observe these warnings could
lead to carbon monoxide poisoning or
death.
Breathing carbon monoxide can cause brain damage
or death. Always read and understand the instruction
manual.
TYPICAL COMMON VENT SYSTEM CONFIGURATIONS
Condensate Drain Port
Figure 26. Common Vent, Vertical Intake, Vertical Vent
26
WARNING
Exhaust
Intake
Non Return
Valve