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March 4, 2002 Page 10 30211C
DV400S DIRECT VENT ROOM HEATER
R
16'
MAX.
15' MAX.
VENTING CAN ONLY TERMINATE
WITHIN THIS AREA.
2'
MIN.
10' MAX.
15" MIN.
4'
29"
59
1
/2"*
* MINIMUM VENT
HEIGHT (CENTER)
(SEE NOTE)
Note: A horizontal run of vent must have a 1/4"
rise for every 1 ft. of run towards the termination.
Never allow the vent to run downward. This could
cause high temperatures and the possibility of a
fire.
15' MAX. HORIZONTAL RUN
2' 3' 4' 5' 6' 7' 8' 9' 10' 11' 12' 13' 14' 15'
16'
Thru
4'
3'
2'
X
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X X
X X
X
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X X X X X
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X X X X X
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V
E
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C
A
L
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CHART A - Venting Combinations
Fig. 2 - Horizontal Lenth
Note: Horizontal runs will require the use of one
vent support for every 3' of vent.
A. Horizontal Termination
Refer to Chart A and Figure 2 for horizontal venting recommendations. The
minimum vertical rise allowed for horizontal termination is 2" from the top of the
heater. The maximum horizontal run allowed for venting is 15' with a minimum
4' rise.
A single vertical to horizontal elbow is already calculated into the allowable 15' run.
Each additional elbow reduces the maximum horizontal distance by 3' feet.
Example: When using three elbows, the maximum horizontal distance has been
reduced to 9' (3 - 1 = 2 elbows x 3' = 6'; 15' max. - 6' of elbows = 9' of horizontal
run.) Even with only these three elbows ( the equivalent of 6' additional horizontal
feet) you now need a minimum of 4' of vertical rise. See Chart A.
If a vertical - to - horizontal elbow is enclosed within a wall, floor or ceiling, an air
space clearance of 3" must be maintained.
Due to the many different combinations that can be used when constructing
venting, the number of vent sections required can only be determined by the
installer.
Horizontal venting must terminate within the shaded area shown in Fig. 2. Chart
A illustrates the figures included in that shaded area. For example, if your vertical
rise is the minimum two feet, venting can terminate anywhere between 20 - 1/2"
(includes wall thickness and assumes 4", and venting required to termination cap)
and 10' feet.
Venting termination must not be recessed into the wall or siding. Fig 3 on Page 9
illustrates termination cap location and minimum dimensions for each termination
application. Or follow ANSI Z223.1, latest edition.