Installation of Venting for Indoor Units
Warning
The following guidelines must be followed for all indoor units:
1.Installation of venting must conform with local building codes. In the absence of local codes, installation must conform with the National Fuel Gas Code, ANSI Z223.1 or in Canada, CAN/
2.For the exhaust pipe, use pipe approved for a category III appliance or single wall, 26 gauge or heavier galvanized vent pipe. The piping is required to be gas tight by ANSI.
3.For the combustion air pipe on separated combustion units, sealed
4.The joints must be sealed with a metallic tape or Silastic™ suitable for temperatures up to 350°F.
5.A minimum of 12 inches of straight vent pipe is recommended after the exhaust connection and before any elbows.
6.Vertical combustion air pipes should be fitted with a tee, drip leg and
7.To reduce condensation, insulate any vent runs greater than 5 feet.
8.All vent pipe connections should be made with at least three corrosion resistant sheet metal screws.
9.Refer to the National Fuel Gas Code for additional piping guidelines.
Note
Vent piping is supplied by others and not supplied by manufacturer.
Note
The drip leg should be cleaned out periodically during the heating season.
Note
Clearances from combustible material for indoor units are determined by the National Fuel Gas Code and/or other local codes.
Venting Methods
There are three venting methods for indoor mounted units. For each method, the units can be vented horizontally through an exterior wall or vertically through the roof. Specific venting instructions are provided for each method and shown in the following pages. Construct the vent system as shown in these instructions. Refer to your unit specific submittal to determine the applicable venting option.
The venting method options are:
Standard Indoor Venting
•uses building air for combustion
•vents exhaust to outdoors
•one exterior roof or wall penetration
Separated Combustion Concentric Venting
•uses outside air for combustion
•vents exhaust to outdoors
•one exterior roof or wall penetration
Separated Combustion
•uses outside air for combustion
•vents exhaust to outdoors
•two exterior roof or wall penetrations
Note
For each method, the units can be vented horizontally through an exterior wall or vertically through the roof. Refer to the specific venting instructions for your unit. Construct the vent system as shown in these instructions.
8 Model IG / IGX
®
