Specifications

57-DVRS50 17
Installation Instructions Cont.
Venting Chart
Maximum Total Venting Length
Maximum total venting allowed is 50ft.
This would be when configured for 40ft
vertical with 10ft horizontal.
Maximum vertical vent is 40ft.
Maximum horizontal vent is 20ft.
Minimum 10ft vertical vent rise required
for maximum 20ft horizontal vent run.
See chart for allowable vent runs.
Maximum horizontal elbows
allowed - 3
Note: if more than 1 90˚ elbow is
used horizontally the maximum hori-
zontal is reduced by 1ft.
Example:
If to reach the desired termination at
point ‘A’ you use 2 90˚ elbows, you
would be required to reduce the maxi-
mum horizontal from16’ to 15’.
If 3 90 ˚ elbows were used to reach
point ’A’, the maximum horizontal
would be reduced from 16’ to 14’.
40
35
30
25
20
15
10
A
5
0 1 2 3 4 5 6 7 8 10 15 20 11 12 13 14 16 17 18 19
Restrictor
Note: The model 57 DVRS50 is supplied
with an adjustable restrictor. The restric-
tor is not required for most installs. How-
ever if the flame is considered too lively,
the restrictor may be installed and ad-
justed to provide the required flame pic-
ture.
Example: Using rigid pipe over 40’ may
require restriction.
V
E
R
T
I
C
A
L
V
E
N
T
R
U
N
HORIZONTAL VENT RUN
Figure 17
Figure 16