Rinnai RU80i Installation And Operation Manual page 36

PVC/CPVC Equivalent Vent Length Calculation Sheet
Fitting / Termination Type
1) 90 elbow
2) 45 elbow
3) IPEX Low Profile Termination
4) IPEX 4" Concentric Termination
5) IPEX 3" Concentric Termination
6) 3" Tee Termination
7) 4" Tee Termination
8) 3" Snorkel Termination
9) 4" Snorkel Termination
10) Length of Straight Section in feet
Note: Ensure switch #1 in the tan bank of dip switches is in OFF position if vent length is greater than 21ft (6.4m).
36
Equivalent Vent Length Calculation Sheet
Number of
fittings
NA
KB Series Manual
Equivalent Vent
Length
5
x
2.5
x
x 5
x 20
20
x
x 5
x 5
10
x
x 10
40
Total (add up
lines 1 through
10)
Total Equivalent
Length
=
=
=
=
=
=
=
=
=
=