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Combustible Header
Combustible Facing
(up to 1" (25mm) thick)
40
1
/
4
"
(1022mm)
2
1
/
2
"
(64mm)
3
1
/
2
"
(89mm)
13
3
/
4
"
(349mm)
13"
(330mm)
3
/
4
"
(19mm)
12"
(305mm)
1
3
/
16
"
(30mm)
Figure 28. Combustible Mantle Clearances.
Initial Installation
QUALIFIED INSTALLERS ONLY
When combustible materials are
directly above a 90
o
elbow, the
clearance from the top of the elbow
is 3” (76mm) for rigid pipe & 4 3/8”
(111mm) for ex pipe. When the
elbow is above the unit, the clearance
is 8” (203mm) above the elbow.
A shelf may be installed above the unit.
We recommend that no heat sensitive
items or components be placed on the
shelf (see Figure 29).
MANTEL CLEARANCES:
It is not necessary to install a mantel, but if one is desired it is important to follow the guidelines.
Top of unit to 2x4 header framing: 0” (0 cm)
Top of unit to bottom of ” (1.9 cm)-1” (2.5 cm) facing: 2” (6.4 cm)
Top of unit to bottom of 3” (8.9 cm) mantel: 13” (33.0 cm)
Top of unit to bottom of 12” (30.5 cm) mantel or ceiling: 13” (34.9 cm)
20
3
/4"
(521mm)
Top of unit
Combustible
front face
Combustible board
Figure 29. Combustible Shelf Clearance
18