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Bosch 660 EF User Manual page 14

Indoor model/ natural gas/lp gas boilers
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Installation instructions
3.3.2
Clearance Requirements from Vent Termi-
nations to Building Openings
All clearance requirements are in accordance with ANSI
Z21.10.3 and the National Fuel Gas Code, ANSI
Z223.1 and in Canada, in accordance with
NSCNGPIC.
Vent Clearances When Heater is Installed
Indoors (For 660 EF appliance)
Maintain the following clearances to any opening in any
building:
• 4' (1.2m) below, 4' (1.2m) horizontally from, or 1'
(0.3m) above any door, operable window, or gravity
air inlet into any building. 3' (0.9m) above any forced
air inlet within 10' (3m).
Fig. 9
For Installations in Canada, clearances are as follows:
To windows, doors, & gravity air inlets: 36" (900mm). To
forced air inlets: 6' (1.8m). These clearance require-
ments hold true for all of the above situations: Indoor.
Outdoor Clearances to Opening into any Building
(For 660 EFO appliance)
Maintain the following clearances to any opening in any
building:
• 1' (0.3m) below, 1' (0.3m) horizontally from, or 1'
(0.3m) above any door, operable window, or gravity
air inlet into any building. 3' (0.9m) above any forced
air inlet within 10' (3m).
14
Fig. 10
Vent Clearances When Heater is Installed in a
Recess Box (For 660 EFO appliance)
Fig. 11 Recess box installation with cover removed
Maintain the following clearances to any opening in any
building:
1' (0.3m) below, 1' (0.3m) horizontally from, or
1' (0.3m) above any door, operable window, or grav-
ity air inlet into any building. 3' (0.9m) above any
forced air inlet within 10' (3m).
Fig. 12
For Installations in Canada, clearances are as follows:
To windows, doors, & gravity air inlets: 36" (900mm).
To forced air inlets: 6' (1.8m).
6 720 644 063

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660 efo