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The vent system must be gas tight. All seams and joints must be sealed withhi temp silicone sealant or metal
tape having a minimum temperature rating of 400º F. For best results, a horizontal vent system should be as
short and straight as possible with Single wall Galvanized steel or Stainless steel vent pipe.
Diameter
4"
For each additional elbow added, deduct 5 ft. from max. vent length.
FOR SIDEWALL VENTING: When a horizontal vent run exceeds 5 ft the following criteria must be observed ;
•
Attach a vertical pipe at least 2" high to the water heater outlet before the horizontal run.
•
Support the vent run at 3 ft intervals with overhead hanger.
•
Pitch up the vent run toward the vent terminal at a rate of 1/ 4" per foot.
Piping side
Front (Maintenance space)
Floor
Back of heater
Non piping side
Top of heater
•
A side wall vent terminal must be used when the water heater is vented through a side wall. Use part
No. FX HOOD. The hood provides a means of installing vent pipe through the building wall and must be
located in accordance with ANSI Z223.1 and local applicable codes.
•
Wall support brackets (needed if wall hanging) must be used. Use part No. 240bracket
Vent terminal
(FX HOOD)
©BBT NORTH AMERICA
Bosch Group
VENT CONNECTIONS
The entire vent system must not exceed the size specified below.
Horizontal & Vertical Venting
Max. No. of Elbow
3 Ea.
Vent Termination
240FX
Max. Vertical or Horizontal run in Length
21 ft
Min. 6"
Min. 4" (24" suggested for maintenance space)
Noncombustible base for either floor or wall mount
1"
Min. 2"
11"
340 Mad River Park, Waitsfield, VT 05673
TWH-TK-01
Wall support
brackets
(240 bracket)
Bosch Water Heating
page 4 of 4
rev 01/06
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