SunStar SPS SERIES - Page 43

Form 43343320
-42- Dec 2017
Vent lengths shown in the table are for horizontal and vertical venting. If a longer length of vertical or horizontal
venting is required contact the manufacturer for assistance with vent sizing.
SINGLE HEATER VENTING (VERTICAL THROUGH THE ROOF)
1. When venting the heater to outside of building through a roof, use single-wall metal pipe. This is to be
constructed of galvanized sheet metal or other approved noncombustible corrosion-resistant material as
allowed by state or local codes.
2. A vent passing through a combustible roof shall extend through an approved clearance roof thimble.
Double-wall, Type B vent must be used for the portion of the vent system which passes through the
combustible roof. An approved vent cap must be attached to end of the flue.
3. The maximum equivalent length of vent pipe should be carefully observed. A safety switch in the heater is
designed to shut the heater off before excessive flue restriction causes bad combustion. Refer to the Vent
Sizing Table for maximum vent lengths and vent pipe diameter.
4. Joints between sections of piping shall be fastened by sheet metal screws or other approved means and
should be sealed to prevent leakage of flue gas into building. Aluminum or Teflon tape suitable for 550ºF
(3M Company tapes 433 or 363) or silicone sealant is recommended.
5. All portions of the vent pipe shall be supported to prevent from sagging (6’ spacing is recommended).
6. When the vent pipe passes through areas where the ambient temperature is likely to induce condensation
of the flue gases, the vent pipe should be insulated and a condensation drain should be provided.
7. Minimum clearance for single-wall flue pipe to combustible material shall be 6 inches. This may be reduced
when the combustible material is protected as specified in the National Fuel Gas Code or the authority
having jurisdiction.
Model
Heat
exchanger
length ft
Maximum vent length ft.
(4” diameter)
Maximum Fresh air
intake length ft (4”
diameter)
Max. combination of
fresh air and vent ft.
(4” diameter)
SPS/U 40
10
45
50
75
SPS/U 40
20
45
50
75
SPS/U 50
20
45
50
75
SPS/U 50
30
35
40
65
SPS/U 50
40
25
30
55
SPS/U 75
20
45
50
75
SPS/U 75
30
35
40
65
SPS/U 75
40
25
30
55
SPS/U 100
30
45
50
75
SPS/U 100
40
35
40
65
SPS/U 100
50
25
30
55
SPS/U 125
30
60
50
75
SPS/U 125
40
50
40
65
SPS/U 125
50
40
30
55
SPS/U 125
60
30
20
45
SPS/U 150
40
60
50
75
SPS/U 150
50
50
40
65
SPS/U 150
60
40
30
55
SPS/U 175
50
60
50
75
SPS/U 175
60
50
40
65
SPS/U 175
70
40
30
55
SPS/U 200
50
60
40
65
SPS/U 200
60
50
30
55
SPS/U 200
70
40
30
45