VERTICAL SIDEWALL APPLICATIONS
The maximum number of 90 degree elbows per side wall installation is four (4), (includes 7DVRT90 off back of unit)
The maximum number of 45 degree elbows permitted per side wall installation is two (2). These elbows can be installed in either the vertical or horizontal run.
When one 90o elbow is installed directly onto another off the back of the fireplace the maximum horizontal vent length is 36" (914mm). Fig. 18.
MAXIMUM 3' (914mm)
7DVRT90
Fig. 18
SIDE VIEW
For each 45 degree elbow installed in the horizontal run (while maintaining a constant horizontal plane), the length of the horizontal run MUST be reduced by 18" (457mm). This does not apply if the 45 degree elbows are installed on the vertical part of the vent system.
If a 90 degree elbow is used in the horizontal vent run (level height maintained) the maxi- mum horizontal vent length is reduced by 36 inches. Fig.19. This does not apply if the 90 degree elbows are used to increase or redi- rect a vertical rise.
Example: According to the vent chart the maximum horizontal vent length is 20 ft.when the vertical height is 7.5 ft. from fireplace base height. If one 90 degree elbow is required in the horizontal vent it must be reduced to 17 ft.
84" |
2134mm |
120" |
3048mm |
90o elbow=3' |
90" |
2286mm |
Fig. 19 |
The maximum number of elbow degrees in a system is 270 o. (This does not include transition elbow from rear vent to vertical vent.) Fig. 20.
Sample: | 1 |
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| 270 o | |||
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Fig. 20
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