Heatiator BIR42 owner manual C. Sidewalls/Surrounds, D. Frame the Fireplace

C. Sidewalls/Surrounds

•Locate adjacent combustible sidewalls a minimum of 24 in. (610 mm) from fireplace opening.

•Mantle leg, surround, stub wall, whether combustible or non-combustible, may be constructed as shown in Figure 6.3.

Note: Grid depicts 1 inch squares.

FLUSH FRONT

BRICK	4 in.
	[102 mm]
FRONT

22 3/8 in.

[568 mm]

50° angle

18 1/2 in.

[470 mm]

24 in. [610 mm]

42in.

[1067 mm]

52-7/8 in.

(1343 mm)

39° angle

24 in. [610 mm]

19 3/4 in.

[500 mm]

Figure 6.3 Mantel Leg, Surround or Wall Projection (acceptable on both sides of opening)

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.

2 in. (51 mm) min. air space clearance

from chimney.

Framing must be extended straight up, all the way to the ceiling.

The fireplace header cannot be positioned until after the fireplace assembly is in place.

Header MUST NOT be notched!

C

D A

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.

B D

Model #		A	B *	C **	D
BIR42	in.	53 7/8	28 3/8	74 1/2	12
	mm	1368	721	1892	305

*If interior of chase will be drywalled, add the thickness to this meaurement.

**Adjust header height for raised floor under fireplace.

Figure 6.4 Framing the Fireplace

20 Heatilator • Birmingham BIR42 • 4059-308 Rev J • 1/11