![Vertical and sidewall combustion air inlet](/images/new-backgrounds/35310/3531057x1.webp)
Installation & Operation Manual
2 Venting (continued)
2.For PVC, CPVC, ABS, dryer vent, or flex duct air inlet piping, use a silicone sealant to ensure a proper seal at the unit inlet and the air inlet cap.
3.For Dryer vent or flex duct, also use a
4.Ensure that the air inlet pipes are properly supported.
WARNING
Properly seal all joints and seams in the inlet vent piping system. Failure to do so may result in flue gas recirculation, spillage of flue products, and carbon monoxide emissions. Carbon monoxide poisoning can cause severe personal injury or death.
Vertical and sidewall combustion air inlet
NOTICE
WARNING
To prevent recirculation of flue products into the combustion air inlet, follow all instructions in this section.
Locate and install the combustion air inlet termination correctly. Failure to do so can allow the discharge of flue products to be drawn into the combustion process. This can result in incomplete combustion and potentially hazardous levels of carbon monoxide in the flue products. This will cause operational problems and the spillage of flue products. Spillage of flue products can cause personal injury or death due to carbon monoxide poisoning.
You must locate the combustion air cap and the flue gas outlet on the same rooftop surface (vertical direct vent system) or sidewall surface (horizontal direct vent system) and in the same pressure zone as the vent termination. Follow all clearance requirements listed on this page.
Purchase and assemble the combustion air inlet cap to protect the air inlet from wind and weather.
Alternatively, assemble the combustion air inlet cap for vertical rooftop air inlet from items purchased locally. The air inlet cap consists of two 90° elbows installed to the air inlet pipe (see FIG.
6"
MAX
Figure 2-13_Vertical Rooftop Air Inlet
Horizontal combustion air inlet clearances
For horizontal direct vent termination of combustion air, you must use the termination cap from the appliance manufacturer. The sidewall air inlet cap is available as part of a direct vent kit. See Table 2E, page 27 for Horizontal Direct Vent Kits.
Vertical Combustion Air Inlet Clearances
You must locate the air inlet termination elbow at least 12" (30cm) above the roof or above normal snow levels.
If the air inlet cap is within a
Do not install the combustion air inlet cap closer than 10 feet (3.05m) from an inside corner of an
You must locate the horizontal air inlet termination point at least 12" (30cm) above grade and above normal snow levels.
If the air inlet cap is within a
Do not install the combustion air inlet cap closer than 10 feet (3.05m) from an inside corner of an
Multiple sidewall direct vent installations
You must locate the horizontal air inlet termination points at least 12" (30cm) above grade and above normal snow levels. The combustion air inlet caps for multiple appliance installations must maintain the same minimum clearance from the closest flue vent cap as specified in single appliance installations. You may install multiple flue outlet caps
Maintain all clearances and installation requirements for multiple appliance installations. |
| 29 |
|