Lennox DT3025 Installation Instructions Manual page 15

VERTICAL VENTING USING ONE 90
(DR/DRH - Rear Vent Units)
V
V
1 ft. min.
2 ft. min.
3 ft. min.
4 ft. min.
FIGURE 19
V1 + V2 =40 ft. Maximum.
H1 = 8 ft. Maximum
H1 + H2 = 17 ft. Maximum.
V1 H1
1 ft. min. 2 ft. max. 3 ft. max.
2 ft. min. 4 ft. max.
3 ft. min. 6 ft. max.
4 ft. min. 8 ft. max.
5 ft. min. 8 ft. max.
6 ft. min. 8 ft. max.
DR/DRH VERTICAL VENTING FIGURES
ELBOW
_
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
H
V+H = 40 ft. MAX.
H = 8 ft. MAX.
H
2 ft. max.
4 ft. max.
6 ft. max.
8 ft. max.
VERTICAL VENTING USING THREE 90 _ ELBOWS
(DR/DRH - Rear Vent Units)
H1 + H2
6 ft. max.
9 ft. max.
12 ft. max.
15 ft. max.
17 ft. max.
VERTICAL VENTING USING TWO 90
V
H2
V2
FIGURE 21
P a g e 1 5
(DR/DRH - Rear Vent Units)
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
H1
H2
V H1 + H2
1 ft. min. 2 ft. max.
2 ft. min. 4 ft. max.
3 ft. min. 6 ft. max.
4 ft. min. 8 ft. max.
40 ft. max. 8 ft. max.
FIGURE 20
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
V1
H1
ELBOWS
_