Bosch SSB255 Installation And Service Manual page 26

26 | Installation
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Fig. 28
Direct vent (sealed combustion)
[1] Forced air inlet
[2] Gravity air inlet
[3] Exhaust terminal
X1 1 foot (305 mm)
X2 See Note 1)
X3 1 foot (305 mm) USA
3 feet (915 mm) Canada
X4 See Note 1)
X5 7 feet (2135 mm) (see Note 2)
YA At least 1 foot (305 mm) above grade or snow line
YB Exhaust terminal must be at least:
3 feet (915 mm) above forced air inlet within
10 feet (3050 mm) horizontally – USA
6 feet (915 mm) above forced air inlet - Canada
Fan assisted appliance (Room air for combustion)
[1] Forced air inlet
[2] Gravity air inlet
[3] Exhaust terminal
X1 1 foot (305 mm)
X2 See Note 1)
X3 1 foot (305 mm) USA
3 feet (915 mm) Canada
X4 See Note 1)
X5 7 feet (2135 mm) (see Note 2)
YA At least 1 foot (305 mm) above grade or snow line
YB Exhaust terminal must be at least:
3 feet (915 mm) above forced air inlet within
10 feet (3050 mm) horizontally – USA
6 feet (915 mm) above forced air inlet - Canada
6720818454 (2016/02) US
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It is not recommended to terminate vent above any door or window,
condensate can freeze causing ice formations.
Do not use chimney as a raceway if another boiler or fireplace is vented
into or through chimney.
All PVC/CPVC vent pipes must be glued, except for the flue gas adapter
pipe connection.
DO NOT use PVC when using anti-freeze in the primary circuit of the
boiler. Use CPVC, PP or stainless steel only!
Vent terminations must keep the following minimum clearances from
electric meters, gas meters, regulators and relief equipment: 4 feet (1220
mm) [Canada 6 feet (1830 mm)] horizontally and in no case above and
below, unless a horizontal distance of 4 feet (1220 mm) [Canada 6 feet
(1830 mm)] is maintained.
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NOTES:
1) For Clearances not specified in ANSI Z223.1 / NFPA
54 or CSA B149.1 Clearance in accordance with local
installation codes and the requirements of the gas supplier
including the Authority having jurisdiction.
2) A vent shall not terminate directly above a sidewalk or
paved driveway that is located between 2 single family
dwellings and serves both dwellings.
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SSB