Majestic Fireplaces® BR/BC Series
Side Wall Protection
Hearth Installation
Adjacent combustible side walls that are within mini- mum dimensions shown in Figure 23 of the fireplace opening must be protected with CFM Corporation Wall Shield Model SP40 or a specifically built wall shield described in Figure 20.
The special wall shield design described in Figure 20 is an alternate method of adding protection to side walls and can be used in place of the SP40 with the same wall clearances specified for the SP40. Rt must =1.85 minimum.
Examples of wall shield insulation:
1.Manville - CERAFORM 126, K=.27, 1/2 inches thick
2.CFM Corporation - EH2416, K = .458, 1 inch thick required.
A hearth extension is required to protect a combustible floor in front of the fireplace. Refer to Figure 23 for mini- mum dimensions and mounting detail.
NOTE: Hearth Extension must not cover the air inlet opening of a fireplace.
The hearth extension described in Figure 23 must be a durable noncombustible material with a minimum (total) Rt value of 1.09; see Figure 24 for examples. The over- all height (above a combustible floor), depth and width must be as indicated, with the extension centered to the fireplace opening.
The top of insulation must be covered with a noncom- bustible decorative covering or a piece of .018” mini- mum sheet metal, to protect hearth extension material.
(Fig. 23)
Secure the hearth extension to the floor to prevent shifting, using trim molding or other similar means at three (3) outer edges. Seal crack between the fireplace hearth and hearth extension with a noncombustible material. (Figs. 23 and 25)
Minimum Wall Clearances
WITH |
|
| WITHOUT |
Noncombustible |
| Noncombustible | |
Surround Facing |
| Surround Facing | |
4" Brick |
| Shaded area starts | |
| 1/2" away from | ||
(Example material) |
| edge of unit | |
|
|
| 4" |
E | F** | Firebox | E D |
| Opening | ||
C** |
| A - Min. clearance |
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| to combustible |
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Side |
| perpendicular wall |
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| B - Min. clearance | Side | |
Wall |
| to combustible | Wall |
|
| perpendicular wall when | |
|
| using noncombustible wall shield* | |
Combustible material permitted within shaded area.
*Noncombustible wall shield requires 1" CFM Corporation EH2416 insulation (minimum R Value = 1.85) between
decorative noncombustible rigid covering and combustible wall. Minimum height and width is 40" x 40".
**Dimension/degree of angle will vary depending on thickness of noncombustible surround facing.
Minimum Hearth Extension Dimensions
(for
| H | G | G |
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| J |
| Seal cracks |
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May install | between the |
| |
noncombustible | fireplace |
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decorative | and hearth |
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covering | extension with |
| |
OR .018" min. | noncombustible |
| |
sheet metal | material |
| Fireplace |
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| Hearth |
4" MIN. |
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Combustible | Minimum | Safety strips | |
Floor | Insulation | must overlap | |
| Value "R" | ���" minimum | |
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| A | B | C | D | E | F | G | H | J |
|
| BR/BC36 | 16" | 12" | 48° | 41° | 18" | 14" | 9" | 16" | 48" |
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|
| 406 mm | 305 mm |
|
| 457 mm | 356 mm | 229 mm | 406 mm | 1219 mm |
|
| BR/BC42 | 20" | 12" | 42° | 35° | 18" | 14" | 12" | 20" | 61¹⁄₂" |
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|
| 508 mm | 305 mm |
|
| 457 mm | 356 mm | 305 mm | 508 mm | 1562 mm | FP594 |
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Fig. 23 Combustible side wall protection and hearth extension dimensions.
16 | 7412944 |
