C. Sidewalls/Surrounds
•Adjacent combustible sidewalls must be located a minimum of 12 in. (305 mm) (may be 24 in) from the fireplace opening.
•Combustible and noncombustible mantel legs, surrounds and stub walls may be constructed per Figure 6.3.
10 3/4 in.
[273 mm]
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| Grid represents 1 in. scale |
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FLUSH |
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| BRICK | |
FRONT |
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| FRONT | |
| angle | A |
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50° | 39° | angle | ||
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B
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| A | B |
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| Model # | Fireplace Opening | Outside Dimensions | |
| 4 in. | A36 | in. | 36 | 42 | |
| mm | 914 | 1067 | |||
[102 mm] |
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| A42 | in. | 42 | 48 |
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| mm | 1067 | 1219 | |
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| 9 3/4 in. |
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| [248 mm] |
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12 in. | 12 in. |
[305 mm] | [305 mm] |
Figure 6.3 Mantel Leg or Wall Projections (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.
•Framing across the top of fireplace must be above top standoffs.
2 in. (51 mm) min. air space clearance from chimney.
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| Header MUST NOT be notched! |
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| D = extra space needed for outside air connection. |
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C |
| If outside air duct has no bend, this dimension may be |
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| reduced as long as minimum clearances are met. |
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B | A |
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| Model # | A | B* | C** |
| D | ||
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| A36 | in. | 43 | 23 | 41 1/2 |
| 8 |
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| mm | 1092 | 584 | 1054 |
| 203 | |
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| A42 | in. | 49 | 23 | 41 1/2 |
| 8 |
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| mm | 1245 | 584 | 1054 |
| 203 | |
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*If interior of chase will be drywalled, add the thickness to this measurement. ** Adjust header height for a raised floor under fireplace.
ÎFigure 6.4 Framing the Fireplace
20 | Heatilator • A36R & A42R • 28376 • Rev AF • 11/08 |
