WR / WC Series Woodburning Fireplace
Side Wall Protection
Hearth Installation
Adjacent combustible side walls that are within the mini- mum dimensions shown in Figure 23 of fireplace open- ing must be protected with MHSC Wall Shield Model SP40 or a specifically built wall shield described below.
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.MHSC - 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; refer to Figure 24 for examples. The overall 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 | Minimum Hearth Extension Dimensions |
WITH | (for |
WITHOUT | |
Noncombustible | Noncombustible |
Surround Facing | Surround Facing |
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4" BRICK |
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| 1/2" away from |
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(Example material) |
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| 4" |
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E | F** |
| FIREBOX |
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| Seal cracks |
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OPENING |
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| May install |
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C** |
| A - Min. clearance |
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| noncombustible |
| fireplace |
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| to combustible |
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| decorative |
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| perpendicular wall |
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| covering |
| extension with |
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SIDE |
| B - Min. clearance |
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| SIDE | OR .018" min. |
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| sheet metal |
| material |
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WALL |
| to combustible |
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| FIREPLACE | |||||
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| perpendicular wall when |
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| HEARTH |
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| using noncombustible wall shield* |
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Combustible material permitted within shaded area. | 4" MIN. |
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* Noncombustible wall shield requires 1" MHSC EH2416 |
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insulation (minimum R Value = 1.85) between decorative | COMBUSTIBLE | MINIMUM | Safety strips |
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noncombustible rigid covering and combustible wall. |
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Minimum height and width is 40" x 40". |
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| FLOOR |
| INSULATION | must overlap |
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** Dimension/degree of angle will vary depending on thickness |
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| VALUE "R" | 1/2" minimum | ||||||||
of noncombustible surround facing. |
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| A | B | C | D | E | F |
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| WR/WC400 | 16" | 12" | 48° | 41° | 18" | 14" |
| 7³⁄₄" | 16" | 48" |
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| 406 mm 305 mm |
| 457 mm | 356 mm | 197 mm | 406 mm 1219 mm |
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| WR/WC500 | 20" | 12" | 42° | 35° | 18" | 14" |
| 11¹⁄₂" | 20" | 61¹⁄₂" |
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| 508 mm 305 mm |
| 457 mm | 356 mm | 292 mm | 508 mm 1562 mm | FP594 | ||||
Fig. 23 Combustible side wall protection and hearth extension dimensions.
16 | 20014528 |