If glass doors are to be installed on these fireplaces, refer to specific installation instructions packed with the glass doors. Use only the doors that are listed for use with these fire- places. Use of other
CAUTION: CERTAIN GLASS DOORS OVERLAP THE BLACK METAL FACING OF THE FIRE- PLACE. IF THE FIREPLACE HAS BEEN FACED WITH NONCOMBUSTIBLE MATERIALS, THERE MIGHT NOT BE SUFFICIENT CLEARANCE TO INSTALL THE GLASS DOORS OF YOUR CHOICE. ENSURE ADEQUATE CLEARANCE IS MAINTAINED AT ALL TIMES SO AS NOT TO INTERFERE WITH THE INSTALLATION AND OPERATION OF GLASS DOORS.
COLD CLIMATE INSULATIONIf you live in a cold climate, it is especially important to seal all cracks around the fireplace opening with noncombustible material and wherever cold air could enter the room. Surrounding materials must be caulked where it meets the black metal facing of the fireplace to avoid cold air intrusion. Use noncombus- tible caulking material only on fireplace facing to seal. Also, the outside air inlet duct should be wrapped with noncombustible insulation to minimize the formation of condensation. Do not place insulation materials on top of fireplace or against chimney sections.
Note: A 2" air space must be preserved for all combustible materials extending for any continuous length adjacent to the chimney.
It is especially important to insulate between the studs of an outside chase cavity and under the floor if the floor is above ground level. Do not place insulation directly against the fireplace or chimney system.
16
It is sometimes best to frame your fireplace after it is positioned and the chimney is in- stalled. Frame enclosure for chimney and fireplace with 2 x 4’s (or heavier) lumber.
Note: The header may rest on the two (2) metal top spacers on top of the unit but the header must not be notched to fit around the spacers.
These fireplaces may sit directly on a combustible surface. A 2" air space is required between combustible framing and the chimney. A 1" air space is required between combustible framing and fireplace outer wrapper. In Canada, the minimum height for a combustible mantel is 18" (457 mm) above the fireplace opening. Figure 46 shows typical Canadian installa- tions. For installations other than Canada, combustible mantels and trim may be installed 12" above the fireplace opening as per NFPA 211, Section
Header
8" Max.
(203mm)
Combustible Mantel
Spacer
18" Min. (457mm)
Finished
Wall
Fireplace
Opening
Canadian Installation
Figure 46
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
12" | Header | |
Max. |
| |
| 1 1/2" | |
Combustible |
| |
Mantel |
| |
and Trim | Spacer | |
12"* | ||
| ||
Min. |
|
| Finished |
8 3/8"* | Wall |
Fireplace
Opening
*Both Of These Dimensions Must Be At Least 18” When An Unvented Gas Log Set Rated At 26,000 BTU Or Higher Is Used. (Maximum 40,000 BTU)
Typical Installation
Figure 47
Hearth Extensions and Wall ShieldsA hearth extension must be installed with all fireplaces. It is to protect the combustible floor in front of the fireplace from both radiant heat and sparks. The hearth extension must extend 8" beyond both sides of the fireplace opening and 16" beyond the front (see Figure 48 ). Use a hearth extension constructed of a durable noncombustible material having an equal or greater insulating value of k = 1.28BTU/IN FT2 HR ° F or a thermal resistance that equals or exceeds r =
.78 HR ° F FT2 IN/BTU. With these values, determine the minimum thickness/material required using the formula and the Table on page 17.
Note: Any noncombustible material whose k value is less than 1.28 or whose r value is more than .78 is acceptable.
If the fireplace is installed on a combustible floor, use the metal safety strips (provided) on the floor extending half under the fireplace and half under the hearth extension (refer to Figures 6 and 7 ).