Page 14
DT/DTH VERTICAL VENTING FIGURES
VERTICAL VENTING WITHOUT ELBOWS
(DT/DTH - Top Vent Units)
V
V = 40 feet
Maximum
Install flashing and storm
collar at the point the vent pipe
passes through the roof.
Firestop/Spacer must be used any time
vent pipe passes through combustible
floor or ceiling or wall.
FIGURE 16
VERTICAL VENTING USING TWO 90
_
ELBOWS
(DT/DTH - Top Vent Units)
V1
H
1 ft. min.
3 ft. max.
2 ft. min.
6 ft. max.
3 ft. min.
9 ft. max.
4 ft. min.
12 ft. max.
5 ft. min.
15 ft. max.
17 ft. max.
6 ft. min.
H
V1
V2
V1 + V2 = 40 ft. Maximum.
H = 17 ft. Maximum.
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
FIGURE 17
VERTICAL VENTING USING THREE 90
_
ELBOWS
(DT/DTH - Top Vent Units)
V1
H1 + H2
1 ft. min.
3 ft. max.
2 ft. min.
6 ft. max.
3 ft. min.
9 ft. max.
4 ft. min.
12 ft. max.
5 ft. min.
15 ft. max.
6 ft. min.
17 ft. max.
V1
H2
H1
V2
V1 + V2 = 40 ft. Maximum.
H1 + H2 = 17 ft. Maximum.
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
FIGURE 18
