10
ALTA
Installation, Operating & Service Instructions
110327-02 - 7/20
Figure 5-1 : Minimum Clearances to Combustible Construction
5 Locating Boiler (continued)
1
4
" (6mm)
6"
(150mm)*
8
1
4
"
(210mm)
1
2
" (13mm)*
1
2
" (13mm)*
Provide access to this area
for inspection and cleanout
of condensate trap
Vent
Air
1
2
" (13mm)*
Closet Door
0-12" (0-305mm)
0-12" (0-305mm)
Closet Door
Ventilation Opening
(if required)
Ventilation Opening
(if required)
This boiler is listed for closet installation with
the following clearances from the boiler jacket
to combustible construction:
Top: 8
1
4
" (210mm), Sides:
1
2
" (13mm),
Front:
1
2
" (13mm), Bottom: 6" (150mm)
Clearances also apply to non-combustible
walls, doors, ceilings and floors.
Clearances from piping to combustible
construction:
Non-Concentric Vent (exhaust):
1
4
" (6mm)
Concentric Vent or Air Intake Piping: 0"
Hot Water Piping:
1
4
" (6mm)
*Recommended Service Clearances:
Sides, Front and Bottom: 24" (610mm)
Ventilation Air
1. Combustion air must be obtained directly
from outdoors, however ventilation openings
may still be required to prevent overheating of
boiler components if boiler is installed in small
space such as a closet.
2. If recommended service clearances shown in
Figure 5-1 are maintained (with all doors to
room closed), no ventilation openings are
required.
3. If recommended service clearances cannot
be maintained, provide two openings into
room, one near floor and other near ceiling.
Top of upper opening to be within 12 in. (305 mm)
of ceiling and bottom of lower opening within 12
in. (305 mm) of floor. Minimum free area 100 in.
2
(650 cm
2
) for each opening. This free area takes
into account blocking effect of grills and louvers.
If using screens, minimum screen size 1/4 in. (6.4
mm).
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