13
V (FT)
H (FT)
3’ MIN.(914mm)
3’ MAX.(914mm)
4’ MIN.(1.2m)
4’ MAX.(1.2m)
18’ MIN.(5.4m)
18’ MAX.(5.4m)
V + V
1
+ H+ H
1
= 40’ MAX.(12.19m)
H+ H
1
= 12’ MAX.(3.66m)
V (FT)
H (FT)
3’MIN.(610mm)
2’ MAX.(610mm)
4’MIN.(1.2m)
2.5’ MAX.(1762mm)
18’ MIN.(5.4m)
12’ MAX.(3.66m)
TOWNSEND II
VENTING WITH THREE (3) 90
o
ELBOWS
V + V
1
+ H+ H
1
= 40’ MAX.(12.19m)
H+ H
1
= 18’ MAX.(5.4m)
TOWNSEND I
VENTING WITH THREE (3) 90
o
ELBOWS
Figure 10. Vent System with three 90° elbows
