All installations and services must be performed by qualified service personnel.
EXAMPLE: 100,000 BTUH input furnaces requires "two" openings of 100 square inches each. A minimum opening of 100 square inches is required regardless of the input.
If the building is tightly constructed and or has an exhaust fan(s) that creates a negative pressure, air for combustion and ventilation must be supplied from the outdoors or from spaces freely communicating with the outdoors. When communicating directly with the outdoors or with vertical ducts to the outdoors, two openings each having a minimum free area of 1 square inch per 4,000 BTU of the input rating of all gas appliances in the area are required. When horizontal ducts are used to communicate with the outdoors, the free area must be based on 2,000 BTUH per square inch of the total input rating of all gas appliances in the area. The minimum dimension of an air duct must be at least 4 inches in diameter.
EXAMPLE: 100,000 BTU input furnace, 40,000 BTU input water heater and 30,000 BTU gas dryer would require two openings of 42.5 square inches each if ducted vertically to the outdoors or 85 square inches each if horizontal ducts are used.
MAKE-UP AIR
Today's emphasis on home insulation and tightness increases the problem of air supply to the furnace. Heavy insulation cuts off infiltration of outside air, which previously replaces inside air removed by bathroom, kitchen and laundry vent fans and air escaping up chimneys. This tightness can cause a negative pressure condition to develop within the home. For this reason, it is recommended that in tightly constructed and insulated homes,
D. VENTING:
NOTICE: A draft control (double acting
The PGT and PGL series furnaces must be vented in accordance with local codes and the National Fuel Gas Code (ANSI- Z223.1 Latest Edition) Category 1 vent tables.
The vent connector must be galvanized or stainless steel metal pipe.
The following items are requirements:
1.Flue or vent connection materials must meet requirements of all applicable local codes and the National Fuel Gas Code
2.A PVC pipe is not an acceptable substitute for a chimney or a flue connector. A chimney with an internal construction of stainless steel or some other material that will withstand the flue gas temperature of 500°F is required.
3.A type B venting system as well as some masonry systems are acceptable as described in the venting tables included in the NFGC. These venting tables also include venting combinations, which apply to common venting arrangements of two appliances.
WARNING: When common venting two appliances into a common vent, the smallest appliance must be vented into the top opening.
WARNING: A Category 1 appliance must never be connected to a chimney that is servicing a solid fuel appliance. If a fireplace chimney, lined with a metal liner is used to vent this appliance, the fireplace opening must be permanently sealed.
4.The chimney height is determined by the height of the surrounding trees, roof, buildings and terrain. The chimney should extend 24" above any surrounding obstructions.
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