Fireplace framing specifications – Lennox Hearth Direct Vent MPD-40 Series User Manual
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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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C
Back wall of chase/enclosure
(including any finishing materials)
a
7 (178)
b
Note-
Venting requirements for rear vent applications in corner installations -
- the horizontal vent length “a” to “b,” must not exceed 28 inches (711 mm)
Inches
(millimeters)
MPDT-3328 AND MPDR-3328 Models -
Dimensions A to F occur when one 45 degree elbow
is connected directly to the appliance collar.
MPD-3530, MPD-4035 and MPD-4540 Models -
Dimensions D and F occur when one 45 degree
elbow is connected directly to the appliance collar.
MPD and MPDR units
D
E
F
A
B
MPD and MPDT units
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A
B
D
7
(178)
5-1/8
12-1/8
(308)
10-1/2
(
267
)
C
VENT FRAMING -
TOP VENT WITH ONE
90° ELBOW
VENT FRAMING -
REAR VENT WITH
NO ELBOWS
Framing should be constructed
of 2x4 or larger lumber.
Inches (mm)
E
(130)
(130)
7
(308)
(178)
E is the required framing depth dimension when the
finish material (drywall) thickness is 1/2 in. (13mm).
1/2
A
FRAMING WITH SQUARE HORIZONTAL TERMINATION (SV4.5HT-2)
5-1/8
12-1/8
Figure 9
Figure 10
Framing Dimensions
FIREPLACE FRAMING SPECIFICATIONS
Corner Framing with Square Termination (SV4.5HT-2)