Справочник Пользователя для Lennox International Inc. GWB8-187IE-2

Check Your Chimney
Chimney must be clean, right size, properly constructed 

and in GOOD CONDITION. 

Installation must conform to requirements of the 

authority having jurisdiction or, in absence of such 

requirements, to the National Fuel Gas Code, ANSI 

Z223.1/NFPA 54 or of the Natural Gas and Propane 

Installation Code, CAN/CSA B149.1, or applicable 

provisions of the local building codes..

Boiler’s induced draft blower has 3” outlet. 3” X 

4” increaser fi tting is included in parts bag. Locate 

increaser fi tting on outlet of induced draft blower, and 

secure gas-tight with bead of furnished silicone sealant. 

Increaser fi tting is required on this boiler for Category I 

venting, and 4” is minimum permissible vent diameter. 

This does not imply vent connector is intended to be 4” 

diameter pipe. Vent connector shall be sized according 

to appropriate venting tables in the National Fuel 

Gas Code and may be required to be larger than 4” 

diameter.

Boiler installation for chimney venting is not complete 

unless increaser fi tting is located and secured.

These are high effi ciency boilers with low stack or 

exhaust temperature.

Venting into masonry chimney without liner, line 

chimney from top to bottom with either:
A.  Listed Type B vent pipe 
B. Listed fl exible vent liner
C.  Poured ceramic liner. 

Outside chimneys should not be used unless they are 

(choose one of the following):
A.  Enclosed in a chase
B.  Lined with Type B vent pipe
C. Use listed fl exible vent liner
D. Use certifi ed chimney  lining system

Vent connector from boiler to chimney should run as 

directly as possible with as few elbows as possible.

Where possible, it is recommended to common vent 

water heater and boiler. Consult appropriate Vent 

Sizing Tables in National Fuel Gas Code for specifi c 

requirements of multiple appliance venting.

Boiler is only appliance connected to vent, Type B vent 

pipe is recommended for vent connector.

Slope pipe up from boiler to chimney not less than 1/4” 

per foot (21mm/m).

End of vent pipe must be fl ush with inside face of 

chimney fl ue. Use sealed-in thimble for chimney 

connection.

Fasten sections of vent pipe with sheet metal screws to 

make piping rigid. Use stovepipe wires to support pipe 

from above.

Do not connect to fi replace fl ue.

Do not install damper on this boiler.

• Use Type B vent pipe through crawl space. Where vent 

pipe passes through combustible wall or partition, use 

ventilated metal thimble. Thimble should be 4 inches 

larger in diameter than vent pipe. 

• Boiler installed with single wall vent, must have 6” 

clearance between its surface and any combustible 

material. New Type B gas vent or fl exible liner must be 

installed in accordance with instructions furnished with 

vent. Maintain clearances as specifi ed for vent pipe.

• Verify vent pipe is fi re-stopped where it goes through 

fl oor or ceiling. It should have approved vent cap with 

clearances from roof. If clearances are less than shown 

in have vent checked by local authorities. See Figure 7, 

Page 11.

• Vent connectors serving appliances vented by natural 

draft shall not be connected into any portion of 

mechanical draft systems operating under positive 

pressure.