Lennox DR3025, Installation Instructions Manual

Page: 17 / 26

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