Venting Installation Tips
Support piping:
·horizontal runs- at least every five (5) feet.
·vertical runs - use braces:
·under or near elbows
Follow items listed below to avoid personal injury or property damage.
·Cut nonmetallic intake pipe with
·Do not use nonmetallic intake pipe or fittings that are cracked or damaged.
·Do not use nonmetallic intake fittings if they are cut or altered.
·Do not drill holes, or use screws or rivets, in non- metallic intake pipe or fittings.
To make metallic vent joints:
·Do not install seams of vent pipe on bottom of runs.
·100% Seal all joints and seams with high temper- ature silicone sealant.
WARNING: Examine the venting system at least once a year. Check all joints and vent pipe connections for tightness, corrosion or deterioration.
NOTE: The words "Flue Exhaust", "Flue" and "Exhaust Vent" are used interchangeably.
Venting Configurations
For heaters connected to gas vents or chimneys, vent installations shall be in accordance with the section
on, Venting of Equipment, of the latest edition of NFGC, or in Canada, B149 Installation Code for Gas Burning Appliances and Equipment, or applicable pro- visions of local building codes.
Fig. 19: Natural Draft Vertical Venting (Category I)
Model | Appliance | Certified | Minimum | Min./Max. Venting Length without | Air Inlet Max. | |
Venting | Recommended | Barometric Damper (feet)** | ||||
No. | Category | Material | Vent Size (inches) | Min. | Max. | Length (feet) |
HD101 |
|
| 4 | 6 |
|
|
HD151 |
|
|
|
| ||
HD201 | I | Type B or | 5 | (HD201) 6 | 25 | 100 |
HD251 | Equivalent | (HD251) 6 | ||||
HD301 |
|
|
| (HD301) 11 |
|
|
HD401 |
|
| 6 | 8 |
|
|
**Vent lengths are based on a lateral length of 2 feet. Refer to the latest edition of the NFGC for further details. (ANSI Z223.1)
Table K: Natural Draft Vertical Venting
25
