E. Hearth Extension
WARNING! Risk of Fire! Hearth extension required to protect combustible floors in front of appliance.
WARNING! Risk of Fire! DO NOT block ventilation slots. A minimum 1/4 in. space between the bottom of hearth refractory and top of field installed hearth exten- sion (marble, tile, granite, etc) is required across full width of fireplace.
If the appliance is to be placed directly on the floor, the
The base of the fireplace may sit on a combustible surface. The area in front of the fireplace must be protected by a noncombustible hearth extension, unless the fireplace is raised a minimum of three inches above the combustible floor or hearth. See Figures 5.7, 5.8 and 5.10.
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MATERIAL ON SIDES |
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(PROFILE VIEW) |
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MINIMUM |
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1/4 INCH SPACE |
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REQUIRED |
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MARBLE, GRANITE, TILE OR |
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OTHER |
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HEARTH EXTENSION |
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3/4 IN. MAX |
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12 IN. |
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WOOD OR OTHER | HEARTH | BOTTOM OF |
COMBUSTIBLE FLOOR | REFRACTORY | FIREPLACE |
OR PLATFORM |
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Figure 5.7 Fireplace Positioned on Combustible Surface
MINIMUM |
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1/4 INCH SPACE |
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REQUIRED |
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BOTTOM OF FIREPLACE | 3 IN. | |
| MIN. | |
| COMBUSTIBLE MATERIAL |
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WOOD OR OTHER | 1 IN. MAX THICKNESS |
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ALLOWED UNDER |
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COMBUSTIBLE |
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FIREPLACE |
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FLOOR OR PLATFORM |
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Figure 5.8 Fireplace Raised A Minimum of 3 Inches Above Combustible Surface
23 IN. |
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NO COMBUSTIBLES | 1/2 IN. BUILDING MATERIAL | |
IN THIS AREA | ||
(MAY BE COMBUSTIBLE) | ||
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39 IN. | COMBUSTIBLE | |
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| FRAMING | |
4 IN. |
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| FACTORY- | |
| SUPPLIED 1/2 IN. | |
| NON- | |
| COMBUSTIBLE | |
| BOARD |
Figure 5.9 Non-Combustible Zone
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| A | B |
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in. | ||
mm | 1530 | 305 |
Figure 5.10 Non-Combustible Hearth Extension Minimum
Dimensions (Fireplace Positioned on Combustible
Surface)
22 | Heat & Glo • |
