FMI MF42ONE - Manual (Page 5)

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LOG SIZING REqUIREMENTS
Log
Size
Minimum Firebox Size
Height Depth
Front
Width
Rear*
Width
42" 29" 15.5" 39" 26.75"
48" 29" 20" 47" 33"
Carefully follow the instructions below. This will ensure safe
installation into a masonry, UL127-listed manufactured fire-
place or listed vent-free firebox.
Minimum Clearances For Side Combustible Material, Side
Wall and Ceiling
A. Clearances from the side of the fireplace cabinet to any com-
bustible material and wall should follow diagram in Figure 2.
Example: The face of a mantel, bookshelf, etc. is made of
combustible material and protrudes 3 1 /2" from the wall.
This combustible material must be 4" from the side of the
fireplace cabinet (see Figure 2).
Note: When installing your gas logs into a manufactured
firebox, follow firebox manufacturer’s instructions for mini-
mum clearances to combustible materials.
B. Clearances from the top of the fireplace opening to the ceil-
ing should not be less than 42".
INSTALLATION
Continued
Figure 2 - Minimum Clearance for Combustible to Wall
*Minimum 16" from Side Wall
*
Example
Minimum Noncombustible Material Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel. If not using
a mantel, follow these instructions.
You must have noncombustible material(s) above the fireplace
opening. Noncombustible materials (such as slate, marble, tile,
etc.) must be at least 1/2" thick. With sheet metal, you must
have noncombustible material behind it. Noncombustible
material must extend at least 8" up (for all models). If noncom-
bustible material is less than 12", you must install the fireplace
hood accessory (24" and 30" Models Only). See Figure 3 for
minimum clearances.
If Using Mantel
You must have noncombustible material(s) above the fireplace
opening. Noncombustible materials (such as slate, marble,
tile, etc.) must be at least 1/2" thick. With sheet metal, you
must have noncombustible material behind it. Noncombus-
tible material must extend at least 8" up (for all models). If
noncombustible material is less than 12", you must install the
fireplace hood accessory. Even if noncombustible material is
more than 12", you may need the hood accessory to deflect
heat away from your mantel shelf. See Figure 3 and Figures
4 and 5, page 6, for minimum clearances.
IMPORTANT: If you cannot meet these minimum clearances,
you must operate appliance with chimney flue damper open.
Go to Installing Damper Clamp Accessory for Vented Opera-
tion, page 7.
MANTEL CLEARANCES
In addition to meeting noncombustible material clearances,
you must also meet required clearances between fireplace
opening and mantel shelf. If you do not meet the clearances
listed below, you will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel shelf and
top of fireplace opening, a hood is not required (see Figure
4, page 6).
Heat Resistant
Material
(A)
Figure 3 - Heat Resistant Material (Slate, Marble, Tile,
etc.) Above Fireplace
Noncombustible
Material Distance
(A) Requirements for Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" Install fireplace hood accessory
(GA6050 or GA6053 see Accessories,
page 21).
Less than 8" Noncombustible material must be ex-
tended to at least 8". See Between 8"
and 12", above. If you cannot extend
material, you must operate appliance
with flue damper open.
MINIMUM FIREPLACE CLEARANCE TO COMBUSTIBLE
MATERIALS
Side Wall 16", Ceiling 42"
Floor 5", Front: 36"