Lennox GWB9 User Manual

23
NOTE: e transition from 2” pipe to 3” pipe must be made
in a vertical run.
MAXIMUM ALLOWABLE TEMPERATURES
OF TYPICAL NON-METALLIC VENT MATERIAL
Material
HDT RTI
Standard
°F °C °F °C
PVC
158 70 – –
ASTM F891 *
ASTM D2665 **
ASTM D1785 **
ASTM D2241 **
CPVC
210 100 – –
ASTM D2846 **
ASTM F441 **
ASTM F442 **
ABS
180 82 – –
ASTM D2661 ***
ASTM F628 ***
Radel - A200
414 212 – –
UL-1738
ULC S636
* Allowable temperatures based on Classications covered in ASTM D4396 [Deection Temperatures under Load
(264 psi) (1819KPa)].
** Allowable temperatures based on Classications covered in ASTM D1784 [Deection Temperatures under Load
(264 psi) (1819KPa)].
*** Allowable temperatures based on Classications covered in ASTM D3965 [Deection Temperatures under Load
(264 psi) (1819KPa)].

Combustion air and vent piping connections on boiler 3.
are sized for 2” pipe. Any pipe size change (to 3”) must be
made outside of the boiler casing in a vertical run of pipe
to allow for proper drainage of vent condensate. Due to
potential for ue gas temperatures over 155°F, the rst ve
(5) feet of vent pipe must be CPVC, the remaining vent
pipe can be PVC. If any elbows are employed within the
rst 5 feet of vent, they must be CPVC too. Two (2) - 30”
pieces of 2” CPVC pipe are furnished with the boiler.

Lennox GWB9 Specifications

General

Brand	Lennox
Model	GWB9
Category	Boiler
Language	English