Lennox DT3025 Installation Instructions Manual page 17

HORIZONTAL VENTING USING ONE 90 _ ELBOW
(DT/DTH - Top Vent Units)
RIGID VENT PIPE SHOWN; **FLEXIBLE VENT
PIPE MAY ALSO BE USED.
Rectangular termination shown;
round termination may also be used.
H
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
* 10-1/2 in. min. for flexible vent pipe.
V
*1 ft. min.
2 ft. min.
3 ft. min.
4 ft. min.
5 ft. min.
20 ft. max. 17 ft. max.
**NOTE: THE LONGEST LENGTH OF FLEX AVAILABLE
IS 48 INCHES OF COMPRESSED FLEX.
FIGURE 23
V1 + V2 H1 + H2
2 ft. min. 4 ft. max.
3 ft. min. 6 ft. max.
4 ft. min. 8 ft. max.
5 ft. min. 15 ft. max.
6 ft. min. 17 ft. max.
20 ft. max. 17 ft. max.
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
*NOTE: THE LONGEST LENGTH OF FLEX AVAILABLE
IS 48 INCHES OF COMPRESSED FLEX.
Rectangular termination shown;
round termination may also be used.
DT/DTH HORIZONTAL VENTING FIGURES
V
H
3 ft. max.
4 ft. max.
6 ft. max.
8 ft. max.
17 ft. max.
HORIZONTAL VENTING USING THREE 90 _ ELBOWS
(DT/DTH - Top Vent Units)
RIGID VENT PIPE SHOWN; *FLEXIBLE VENT
PIPE MAY ALSO BE USED.
HORIZONTAL VENTING USING TWO 90 _ ELBOWS
RIGID VENT PIPE SHOWN; **FLEXIBLE VENT
H2
Firestop/Spacer must be used any
time vent pipe passes through
combustible floor or ceiling or wall.
Rectangular termination shown;
round termination may also be used.
**NOTE: THE LONGEST LENGTH OF FLEX AVAILABLE
IS 48 INCHES OF COMPRESSED FLEX.
H2
V2
FIGURE 25
P a g e 1 7
(DT/DTH - Top Vent Units)
PIPE MAY ALSO BE USED.
H1
* 10-1/2 in. min. for flexible vent pipe.
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.
20 ft. max. 17 ft. max.
FIGURE 24
H1
V1
V1