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Vertical Category I Vent System - Vent Pipe Only
Vertical Category I Vent System - Vent Pipe and
Air Inlet Pipe, Flat Roof
HORIZONTAL VENTING
WARNING: Proper Vent Pipe Required!
Failure to follow instructions could result in death, serious
injury, and property damage.
Never use a pipe of a diameter other than specified!
Never use PVC, ABS, or any other non-metallic pipe for
venting!
WARNING: Hazardous Flue Gas!
Failure to follow instructions could result in flue gas
leaks into the space resulting in death, serious injury, or
substantial property damage.
Do not use Type B (double wall) vent internally within the
building on horizontally vented power vented units.
1.
2.
3.
4.
5.
6.
7.
8.
FIGURE 6
9.
10. Maintain 6" clearances between the vent pipe and combustible
11. A tee with drip leg, cap and condensate drain should be installed
12. The vent pipe and inlet pipe (separated combustion models) must
13. The vent pipe must extend 20" (50.8 cm) beyond the exterior
14. The air inlet pipe must extend 4" (30.5 cm) beyond the exterior
15. Do not terminate the vent pipe over public walkways or over
FIGURE 7
16. The vent pipe and inlet pipe (separated combustion models) must
17. The inlet air pipe must be a minimum of 12" (30.5 cm) apart from
Vent Pipe Diameters and Total Equivalent Pipe
Model Size
9
Compact Unit Heater
Horizontal venting is Category III. Category III vent pipe has a
positive pressure inside the pipe. If Category III vent pipe is not
used and installed per the Category III manufacturers instructions,
carbon monoxide can leak into the building.
Commercial/industrial horizontally vented Category III heaters
may be vented with an agency certified (UL 1738) Category III
venting system and where allowed by code, appropriately sealed
26 gauge or heavier galvanized steel.
Do not attach the vent pipe or inlet pipe to any other appliances
or vent systems. This heater must have a dedicated vent pipe and
inlet pipe.
Do not mix different brands and types of Category III vent pipe.
Refer to Table 7 for total minimum and maximum vent lengths.
The equivalent length of a 90°elbow is 5' (1.5 m) for 4" (10.2 cm)
diameter and 7' (2.1 m) for 6" (15.2 cm) diameter.
Refer to Figures 8 and 9 for horizontal venting requirements.
Horizontal sections of vent pipe are to be installed with a
minimum downward slope from the appliance of 1/4 inch per
foot (6.35 mm per 30.5 cm). If local code allows, a 1/4 inch per
foot upward slope can be installed.
Securely support horizontal vent and inlet air pipe every 3 feet
(0.91 m) with steel strapping or other material that can withstand
the temperature and rigidity required.
surfaces or materials. Greater distances may be necessary if
surfaces or materials can be damaged by high heat.
at the lowest point of the vent pipe prior to exiting the structure/
building.
terminate with a listed vent terminal/cap with the size listed in
Table 5.
surface of an exterior wall or further if there is a potential for
heat damage on building materials.
surface of the exterior wall.
an area where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of regulators,
relief openings, or other equipment.
be installed 12" (30.5 cm) above the snow line. Consider snow
drifts.
the vent pipe, and 4" (10.2 cm) from the exterior wall.
TABLE 7
Lengths for Horizontal Venting
Vent Pipe
Diameter
100-150
4" (10.2 cm)
200
4" (10.2 cm)
250-400
6" (15.2 cm)
Operating Instructions and Owner's Manual
Equivalent Vent Length
Minimum
Maximum
5' (1.5 m)
30' (9 m)
5' (1.5 m)
50' (15.25 m)
5' (1.5 m)
50' (15.25 m)
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