Lennox DR3025, Installation Instructions Manual

Page: 15 / 26

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