Venting Graph - Marquis MQHBZDV3636 Instruction Manual

Venting Routes And Components
Since it is very important that the vent system maintain its bal-
ance between the combustion air intake and the flue gas
exhaust, certain limitations as to vent configurations apply and
must be strictly adhered to.
The table showing the relationship between vertical and hori-
zontal side wall venting will help to determine the various vent
lengths.
The maximum horizontal run with the 90 degree bend at the
fireplace flue outlet is 4 ft/122cm (Figure #1). The maximum
horizontal run is 20 ft/6.1 m when the vertical run is 7 ft/2.1m
(Figure #2). Note: 1/4" vertical rise is required for every 12" of
horizontal run.
The maximum number of 45 degree bends per side wall installa-
tion is two (2) in the horizontal run and then you must reduce
the length of the horizontal by 18 inches for each 45 degree
bend.
The maximum vertical run is 40 ft/12.2 meters.
Special Note: For each 45 degree bend installed in the hori-
zontal run, the length of the horizontal run must be reduced
by 18" (45cm). This does not apply if the 45 degree bends
are installed on the vertical part of the vent system.
Example: If according to the table, the length of the horizontal
run is 10 feet, and two 45 degree bends are required, the hori-
zontal run length must be reduced to 7 feet.
2 additional 90° bends or equals are allowed. The horizontal
run must be reduced by 36" per each 90° bend, or 18" per each
45° bend.
Important: Always locate the fireplace in such a way that a mini-
mum of offsets and/or horizontal runs are required. 1/4" vertical rise is
required for every 12" horizontal run.
How To Use The Horizontal Vent Table
1. Determine the height of the system and the number of bends
2. Having determined the vertical distance determine the maxi-
3. Vent table has been established for 90˚ horizontal/vertical
Horizontal Venting Table From Bottom of Fireplace
Example A:
If the vertical dimension
from the floor of the fire-
MQHB36 - 35"
place is 6ft, the horizontal
MQHB42 - 37"
run to the wall flange of the
MQHB47 - 45 1/2"
vent termination must not
exceed 12ft.
NOTE: The final location
of the fireplace must be
such that the horizontal
vent dimensions fall with-
in those stated on the
graph. The Maximum
Vertical vent run is 40ft.
(12.2 meters).
Important: Minimum
clearance between vent
pipes and combustible mate-
rials is 1 inch (25mm).
47
required.
mum horizontal section allowed.
runs. With use of flex pipe distance not having 90˚ bends will
not fall into vent table standards. See Fig. B.
for venting to a maximum of 40 ft. (12.2 meters)
Total Vertical
Feet Meters
4 1.2
5 1.5
6 1.8
7 2.1
8 2.4
9 2.7
10 3.0
11 3.4
12 3.7
13 4.0
14 4.3
15 4.6
16 4.9
17 5.2
18 5.5
19 5.8
20 6.1
25 7.5
30 9
40 12.2
It is recommended for Propane Horizontal Installations
that the venting should be a minimum of one foot vertical
off the flue before the elbow on any horizontal runs of
one foot or greater. This allows for cleaner combustion
and greatly reduces carboning and cleaning of glass.
(Does not apply to Back Flue Models).
Max Total Horizontal
Feet Meters
5 1.5
8 1.2
12 3.7
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
20 6.1
15 4.6
10 3.0
0 0