Minimum clearance to combustibles on venting is 1” with
the following exceptions:
MQRB4436
MQRB5143
MQRB6961
Top of horizontal
2”
2”
2”
Top of 90 degree elbow in an enclosure under 72”
5” with Z57WTS
5” with Z57WTS
N/A
Top of 90 degree elbow in an en
closure over 72”
4”
4”
N/A
Top of 90 degree elbow in an enclosure under 78”
N/A
N/A
6-
1/2” with Z57WTS
Top of 90 degree elbow in an enclosure over 78”
N/A
N/A
6-
1/2”
Minimum Enclosure Height (See
Enclosure Heights
page)
60”
60”
64” Vertical
68” Horizon
tal
Minimum Termination Height from bottom of Unit
37-
1/2” + ¼” rise/ ft
51-
1/2” + ¼” rise/ ft
56-
1/2” + ¼” rise / ft
Horizontal Vent Table
To use the Horizontal Vent Table (see Table 1), determine the total vertical height of the system and the number of bends
required. Locate the value on the first column and then move across to see the corresponding maximum allowable horizontal
run.
All Measurements are from the bottom of the appliance.
Total Vertical
Max. Horizontal
Total
Vertical
Max. Horizontal
Feet
Meters
Feet
Meters
Feet
Meters
Feet
Meters
MQRB4436
MQRB5143
MQRB6961
37-1/2"
51-
1/2”
56-
1/2”
1
1.3
1.4
3
.91
14
4.3
20
6.1
4*
1.2*
4*
1.2*
5
1.5
5
1.5
15
4.6
20
6.1
6
1.8
8
2.4
16
4.9
20
6.1
7
2.1
15
4.6
17
5.2
20
6.1
8
2.4
20
6.1
18
5.5
20
6.1
9
2.7
20
6.1
19
5.8
20
6.1
10
3.0
20
6.1
20
6.1
20
6.1
11
3.4
20
6.1
25
7.5
15
4.6
12
3.7
20
6.1
30
9.0
10
3.0
13
4.0
20
6.1
43
12.2
0
0
Table 1 - Horizontal Vent Table
Figure 1
A HORIZONTAL VENT CERTIFIED GUARD (SAFETY CAGE) IS AVAILABLE WHEN REQUIRED BY LOCAL CODES.
MQRB5143 / MQRB4436
: See
Flue Restrictor Adjustment
Page for vertically vented Installations.
NOTE: The final location of the fireplace must be such that the horizontal vent dimensions fall within those stated on the graph.
The Maximum Vertical vent run is 43ft. Please refer to
Clearance to Combustibles
information in this manual.
8ft
MQRB6961
: Note Clearances of Termination from vented
and unvented soffit (24”) and adjacent Side wall (6”). Also
see
D
and
E
on
Venting
page.
For Propane Horizontal
installations on
MQRB4436 &
MQRB5143, the
venting must be a
minimum of two feet
vertical off the flue
before going horizontal.
*4436MQRB
Only
24” Min
To Centerline
To Edge of Plate
The minimum vertical installation height must be adhered to.
Flex pipe venting must be fully stretched.
87
