VENTING REQUIREMENTS
When connecting to gas vents or chimneys, vent installations shall be in accordance with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI
Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.
When two or more appliances vent into a common flue, the area of the common flue should be at least equal to the area of the largest flue plus 50% of the areas of the additional flue or vent connectors.
When an existing boiler is removed from common venting system, common venting system is likely to be too large for proper venting of appliances remaining connected to it. At time of removal of existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while other appliances remaining connected to the common venting system are not in operation:
1.Seal all unused openings in common venting system.
2.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
3.Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
4.Place in operation the appliance being inspected. Fo- llow the lighting instructions. Adjust thermostat so appliance will operate continuously.
5.Test for spillage at draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from cigarette, cigar or pipe.
6.After it has been determined that each appliance remaining connected to common venting system proper- ly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other
7.Any improper operation of the common venting sys- tem should be corrected so the installation conforms with National Fuel Gas Code, ANSI
DANGER: A chimney which does not meet modern safety standards will result in a fire or deadly carbon monoxide poisoning of the building residents.
CHIMNEY REQUIREMENTS
Chimney condition is of paramount importance for a safe and efficient boiler installation. All new and replacement installations must include a chimney inspection by a qualified individual or agency. Chimney construction materials must be compatible with the fuel being used.
Particular attention should be paid on all
COMBUSTION AIR REQUIREMENTS
Provisions for combustion air must be in accordance with the National Fuel Gas Code ANSI Z223.1 - latest edition, as well as all applicable local codes. If the boiler is installed in an unconfined space, adequate air will be available via normal infiltration. However, if building construction is unusually tight or the boiler is installed in a confined space (a space whose volume is less than 50 cubic feet per 1000 Btu/hr of gas input for all fuel burning equipment), adequate air for combustion must be provided by two openings: one located about 6” below the ceiling, the other about 6” above the floor. When communicating directly with the outside or through a vertical duct, each opening must have a minimum free area of one square inch per 4000 Btu/hr of gas input. Horizontal ducts to the outside must have a minimum free area of one square inch per 2000 Btu/hr of gas input. When ventilation is provided by openings in doors, etc. to adjoining spaces having adequate infiltration, each opening must have a minimum free area of one square inch per 1000 Btu/hr of gas input.
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