5.Vent termination must be a minimum of 4’ (1.2m) below or 4’ (1.2m) horizontally from any soffit vent or
6.Vent must be a minimum of 6’ from an inside corner formed by two exterior walls. If possible, leave a 10’ clearance.
7.Vent termination must be a minimum of 10’ (3m) from any forced air inlet (includes fresh air inlet for other appliances, such as a dryer).
8.When termination is routed through an exterior combustible wall the vent must be supported using a listed clearance thimble. Seal the connection between the single wall and double wall pipes and the annular space of the double wall pipe as shown in figure 2. Inside edge of vent termination tee must be at least 12 inches from outside wall as shown in figure 3.
9.For horizontal venting, the vent pipe shall be supported with hangers no more than 3ft. (1m) apart to prevent movement after installation.
D – HORIZONTAL VENTING – COMMERCIAL
1.Horizontal commercial installations are for buildings which are not attached to living spaces. The vent may be single wall vent material installed according to the sections
Venting A - General Recommendations and Requirements and C - Horizontal Venting General and D - Horizontal Venting - Commercial. Refer to figure 3.
2.The vent pipe diameter for horizontal commercial installations shall be 4” (76mm) on 50 units. In all cases, a flue transition piece (supplied) is required to fit over the outlet of the induced draft assembly on the appliance.
3.Refer to table 2 for maximum vent connector lengths.
4.Select a wall termination point that will maintain ¼” rise per foot slope of horizontal run of vent pipe.
5.For upward sloped vent a condensate tee and drain must be installed within the first 5’ (1.5m) from the unit heater to protect the appliance. If a flexible condensate drain line is used, the drain line must include a loop entering the structure. If the unit is shut down for an extended period of time and will be exposed to
E – HORIZONTAL VENTING – RESIDENTIAL
1.For horizontal residential installations these units are certified as Category III appliances. Venting A - General Recommendations and Requirements and C - Horizontal Venting General and E - Horizontal Venting - Residential.
Refer to figure 6.
2.The vent pipe diameter for horizontal residential installations shall be 4” (100mm) on 50 and 80 units. A standard vent transition is required at unit in addition to the transition supplied with the unit.
3.The maximum vent length is 5’ (1.5m) plus one
4.The vent must maintain a ¼” rise per foot of slope upwards toward the termination.
CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP
UPWARD SLOPE ON HORIZONTAL
CATEGORY III VENT ACCORDING TO THESE INSTALLATION INSTRUCTIONS.
SLOPE: + 1/4 INCH FOR 1 FOOT RUN MINIMUM.
FLUE TRANSITION
(PROVIDED)
LISTED THIMBLE
THROUGH COMBUSTIBLE
WALL
INDUCED DRAFT BLOWER
NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (914MM), |
|
NOT INCLUDING CAP FOR TERMINATION. REFER TO TABLE | DRAIN LOOP WITH WATER |
2 FOR MAXIMUM LENGTH AND NUMBER OF ELBOWS. | TRAP (TO CONDENSATE DRAIN) |
12 INCHES MIN.
(30.5 CM)
EXHAUST VENT
TERMINATION TEE
12” (30.5 CM)
MINIMUM ABOVE ALL HIGHEST SNOWFALL
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT / UTILITY HEATER
FIGURE 3
Compact Unit / Utility Heater | Operating Instructions and Owner’s Manual |