Fireplace Specifi Cations; Gas Vent Rule - Lennox Hearth Products MPB3328CNE Installation Instructions Manual
B-vent mpb-33/35/40/45 series b-vent gas fireplaces
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FIREPLACE SPECIFICATIONS
5-1/2
(140)
OUTSIDE AIR
SHUTTER
9-3/8
(238)
GAS INLET
8-15/16
(See Also
(227)
Right Side View)
ELECTRICAL
INLET
(Optional)
Left Side View
M
d o
l e
N
. o
in.
MPB3328
mm
. n i
MPB3530
m
. n i
MPB4035
m
. n i
MPB4540
m
Figure 4
Venting
GAS VENT RULE
Gas vent caps are not permitted within 8 feet
(2.4 mm) of a vertical wall or similar obstruc-
tion. Gas vent caps that are located 8' or more
from a portion of a building which extends at
an angle greater than 45° upward from the
horizontal may terminate in accordance with
Table 4 and Figure 5, provided that in no case
shall any discharge opening on the cap be less
than 2' (610 mm) horizontally from the roof
surface (National Fuel Gas Code ANSI Z223.1
(NFPA 54) 7.6.2) (CAN/CGA B149).
FRAMING
SPACERS
(Top and Sides
and Rear)
ELECTRICAL INLET
(See Also
Right Side View)
A
3
1-3/8
(76)
(35)
7-3/8
(187)
A
B
C
33-1/8
30-1/8
17
841
765
432
5 3
1 -
8 /
2 3
1 -
8 /
9 1
m
8
2 9
8
6 1
4
3 8
0 4
1 -
8 /
7 3
1 -
8 /
4 2
m
0 1
9 1
9
3 4
6
0 1
0 4
1 -
8 /
7 3
1 -
8 /
4 2
m
1 1
6 4
9
3 4
6
0 1
Gas Vent Rule
Figure 5
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
F
G
H
J
Top View
3 (76)
E
C
B
D
Front View
D
E
F
21-1/2
27-1/2
33-1/8
699
841
546
24-7/8
9 2
1 -
2 /
5 3
1 -
8 /
-
8 /
12-7/16
7
9 4
8
2 9
6
621
2 3
4 3
1 -
2 /
0 4
1 -
8 /
9 2
7 -
8 /
1
8
6 7
0 1
9 1
7
9 5
9 3
1 -
2 /
5 4
1 -
8 /
4 3
7 -
8 /
0 1
3 0
1 1
6 4
8
6 8
X
12
Roof Pitch is X/12
Minimum Height from Roof to
Lowest Discharge Opening
1" (25 mm)
Minimum
Flue Outlet For B-Vent Connection
NOTE - Hood shown
as positioned
in louvered
front model.
GAS INLET
(Either Side
and bottom)
OPTIONAL ELECTRICAL
INLET KNOCKOUT
REQUIRING A FIELD
PROVIDED JUNCTION
BOX (Either Side)
3 (76)
1
(35)
Right Side View
K
J
G
H
4
10-3/4
6-1/2
13
273
102
165
330
- 2
/ 7
6 1
5
8-3/4
16
3
6 1
1
7 2
222
406
4
1 -
/ 5
6 1
5
8-3/4
16
3
9 7
1
7 2
2
22
406
1
- 7
/ 7
6 1
6
8-3/4
16
4
3 4
1
2 5
222
406
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1, 7.6
Roof Pitch
Flat to 6/12
Over 7/12 to 9/12
Over 10/12 to 12/12
4' 0"
Over 13/12 to 16/12
6' 0"
Over 17/12 to 21/12
8' 0"
Table 4
Note: Venting terminals shall not be recessed
into a wall or siding.
ELECTRICAL INLET
2-3/4 x 2 (70 x 51) COVER
PLATE with KNOCKOUT)
K
1/2 (13)
5-1/2
(140)
9-3/8
(238)
2
(53)
Feet
Meters
1' 0"
0.3
2' 0"
0.6
1.2
1.8
2.4
5
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