Reznor FT Unit Installation Manual User Manual
Page 8
Form RZ-NA-I-FT, Mfg No. 173473 Rev 8, Page 7
NOR
5 ft (1.5M)
maximum
Thimble (if wall
is combustible)
If using single-wall pipe,
drill a 3/8 diameter hole in
elbow for water drainage.
8 (203mm)
minimum
8 (203mm) minimum
6 (152mm) minimum
Pitch horizontal pipe 1/4 per foot
toward outlet for water drainage.
3. Vent Pipe Diameter and Vent Length
Comply with all requirements that apply. Use only one diameter of vent pipe on an installation. Minimum vent length is 5 feet.
IMPORTANT Vent Length NOTES:
1) If the system contains all vertical pipe or a combination of
horizontal and vertical vent pipe
, the Maximum Permissible Vent
Length in the Table may be increased one foot for each foot of
vertical rise up to a maximum increase of ten feet.
2) If using vent pipe approved for a Category I appliance to
install a horizontal vent on a residential application
, the maxi-
mum horizontal length is five feet (1.5M). Do not include the el-
bow used to connect the horizontal section to the vertical section in
the 5-foot limit. The vertical portion must be a minimum of 8". See
Special Requirements below and Figure 6.
Special Vent Pipe Requirements for Residential Horizontal Vent System
Using Category I Pipe (See Figure 6)
When installing pipe approved for a Category I heater in a residential hori-
zontal vent system, it is necessary to use 4" pipe only on a Size 30 and 5"
pipe only on Sizes 45 and 60. Sizes 45 and 60 will require an increaser collar
at the venter outlet. The maximum horizontal vent length for a residential
Category I vent is 5 ft (1.5M); see Figure 6.
Model
Vent
Venter
Field-supplied "increaser"
FT
Pipe
Outlet
collar required to connect
Size
Diameter
Diameter
pipe to venter outlet
30
4"
4"
No
45
5"
4"
Yes
60
5"
4"
Yes
90°
Elbows
45°
Elbows
30 ft
5 ft
2.5 ft
9 M
1.5M
.75M
30 ft
5 ft
2.5 ft
9 M
1.5M
.75M
30 ft
5 ft
2.5 ft
9 M
1.5M
.75M
40 ft
5 ft
2.5 ft
12 M
1.5M
.75M
30 ft
5 ft
2.5 ft
9 M
1.5M
.75M
40 ft
5 ft
2.5 ft
12 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
50 ft
5 ft
2.5 ft
15 M
1.5M
.75M
300
6"
Maximum Vent
Length
*Reduce the maximum vent length by the amount indicated for
each elbow used.
30
3" or 4"
45
3" or 4"
100
4"
200
5"
250
5"
125
4"
150
5"
60
75
3"
4"
3"
4"
Maximum Permissible Vent Lengths
FT
Equivalent
S traight Length*
Vent Pipe
Diameter
(se e NO TES and special
requireme nts in the right column)
Figure 6 - Horizontal Vent on a Residential Installation using Category I Vent Pipe
•
Size 30 requires 4" diameter vent pipe
•
Size 45 requires 5" diameter vent pipe
•
Size 60 requires 5" diameter vent pipe
•
Maximum horizontal vent length is 5' (1.5M)
•
Minimum vertical vent length is 8" (203mm)
•
Comply with clearances
•
Drill the elbow as illustrated (single-wall pipe only)