Hearth and Home Technologies BIR50-B - Manual (Page 20)

20
60-7/8 in.
50 in.
18 1/2 in.
[470 mm]
19 3/4 in.
[500 mm]
4 in.
[102 mm]
50° angle
39° angle
24 in.
[610 mm]
BRICK
FRONT
FLUSH
FRONT
24 in.
[610 mm]
22 3/8 in.
[568 mm]
Note: Grid depicts 1 inch squares.
Figure 6.3 Combustible Mantel Leg or Wall Projections (acceptable on both sides of opening)
C. Sidewalls/Surrounds
• Locate adjacent combustible sidewalls a minimum of 24 in. (610 mm) from fireplace opening.
• Combustible and non-combustible mantel legs, surrounds and stub walls may be constructed per Figure 6.3.
D. Frame the Fireplace
Figure 6.4 shows typical framing using combustible materials (2x4 lumber shown).
• Observe all required air space clearances to combustible materials as shown in Figure 6.2.
• Framing across the top of fireplace must be above top standoffs.
Figure 6.4 Framing the Fireplace
B
C
A
2 in. (51 mm)
min. air space
clearance
from chimney.
Header MUST NOT be notched!
D
D = extra space needed for outside air connection.
If outside air duct has no bend, this dimension may be
reduced as long as minimum clearances are met.
D
The fireplace header cannot be positioned until
after the fireplace assembly is in place.
Framing must be extended straight up, all
the way to the ceiling.
E
A B * C ** D E min.
in. 61 7/8 28 3/8 74 1/2 12 21
mm 1572 721 1892 305 533
Model #
** Adjust header height for raised floor under fireplace.
BIR-50
* If interior of chase will be drywalled, add the thickness to this meaurement.
Heatilator • Birmingham BIR50-B • 4059-682D • 9/12