36
1/2” (13mm) thick
non-combustible
cement board
Joints preferred
at corners to
prevent cracking
Gypsum board
up to perimeter
of cement board
Min.
9-1/4”
(235 mm)
Min.
25-1/2”
(648 mm)
14-3/4”
(375 mm)
Board flush with
bottom of heater;
add extra if
overlapping
framing.
64-1/8”
(1629 mm)
Min. 74-1/8”
(1883 mm)
Min.
49-1/2”
(1257 mm)
Installation
Plan Wall Finish
Non-combustible cement board
The L3 Linear
fi
replace requires a 1/2”
(13 mm) thick non-combustible cement
board to be used as a wall surface
immediately surrounding the unit on each
side—see diagram below for minimum
coverage.
Extending the cement board well beyond
the minimum shown will help avoid cracking
due to differential expansion of materials.
Pre-drill cement board with oversized holes
and do not over-tighten screws to avoid
cracking due to heat expansion.
Standard gypsum wall board may be used
beyond the perimeter of the cement board.
Non-combustible
fi
nishing over
cement board
Additional non-combustible material such
as tile, etc., may be applied over top of the
cement board or you may choose to leave it
fi
nished clean with no tile—see page 38.
Be aware that a trim is always required
and that the 1850 and 1875 style trims will
accept tile, etc. tucked behind them (up to
5/8” thick for the 1875 and up to 1 inch thick
for the 1850). Additional non-combustible
fi
nishes, if desired, may be butted up to the
trims. Finish
should not cover
the trims.
Minimum cement board dimensions
Wider trim (1850) can
adjust up to 1” forward of
surface of cement board
Narrow trim (1875) can adjust
up to 5/8” forward of surface of
cement board.
QUALIFIED
INSTALLER