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SUPPORT AND GUIDE SPACING FOR MODEL DS & DSLS
MVS
Inside
diameter
Interior
Exterior
3"
10
8
4"
10
8
5"
10
8
6"
10
8
7"
10
8
8"
10
8
9"
10
8
10"
10
8
12"
10
8
14"
10
8
16"
10
8
18"
10
8
20"
10
8
22"
10
8
24"
10
8
26"
10
8
28"
10
8
30"
10
8
32"
10
8
34"
10
8
36"
10
8
Table 7: Support and Guide Spacing for Model DS & DSLS. Dimensions are in feet
SUPPORT AND GUIDE SPACING FOR MODEL DSD & DSID & DSLD
MVS
Inside
diameter
Interior
Exterior
3"
10
8
4"
10
8
5"
10
8
6"
10
8
7"
10
8
8"
10
8
9"
10
8
10"
10
8
12"
10
8
14"
10
8
16"
10
8
18"
10
8
20"
10
8
22"
10
8
24"
10
8
26"
10
8
28"
10
8
30"
10
8
32"
10
8
34"
10
8
36"
10
8
Table 8: Support and Guide Spacing for Model DSD, DSID & DSLD. Dimensions are in feet
MVS : Maximum Vertical Spacing between Guides/Supports
MHS: Maximum Horizontal Spacing between Guides/Supports
MDE: Maximum Distance between Elbows
H: Maximum Freestanding Height above the Roof
S: Maximum Suspended Length
6
MHS
MDE
H
S
12
12
10
50
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
10
100
12
12
12
100
12
12
12
100
12
12
12
100
12
12
12
100
12
12
12
100
12
12
12
100
MHS
MDE
H
S
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
10
50
12
12
12
50
12
12
12
50
12
12
12
50
12
12
12
50
12
12
12
50
12
12
12
50
HORIZONTAL INSTALLATION REQUIREMENTS
•
When venting through a sidewall, terminate the system not less than 12"
(.3m) above the ground and above the snow line in geographical areas
where snow accumulates. The termination area must be kept clear of
snow and ice at all times. See Figure 1.
•
Terminate the system at least 7' (2.1m) above a public walkway or
driveway, no less than 6' (1.8m) from the combustion air intake of any
appliance or 3' (.9m) from any other building opening, gas utility meter,
service regulator or the like. Less distance is permitted if specified in the
appliance's installation instructions. It also shall terminate at least 3' (.9M)
above any forced air inlet within 10' (3.1m) and shall terminate at least 4'
(1.2m) below, 4' horizontally from, or 1' (.3m) above any door, window, or
gravity air inlet into any building as provided in the National Fuel Gas Code
ANSI Z223.1 and NFPA 54. See Figure 1. Proper judgment may require
greater distances depending on the side of the equipment installed or
to allow for snow drifting or falling from falling from overhead roofs or
trees. The termination should be far enough away from trees, shrubs,
or decorative items to prevent damage.
•
The total horizontal vent length from the appliance flue collar to the outside
termination shall be in accordance with the appliance manufacturer's
instructions.
1 ft. above doors and windows
4 ft below any
window or fresh air
inlet
1 ft. above ground or
snow line
Figure 1 - Horizontal Termination Requirements
4 ft. horizontally from door
and windows
7 ft above
public
walkways
and drives
Sidewalk
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