PFG Series 7
Chimney or vent requirements
(also refer to Breaching erection, Page 12)
Venting must be installed according to Part 7,Venting of Equipment, of National Fuel Gas Code, ANSI Z223.1- latest edition and applicable building codes. Canadian installations must comply with CAN/CSA B149.1 or .2 Installation Codes.
Minimum chimney or vent sizes are on page 22. A chim- ney or vent without a listed cap should extend at least 3 feet above the highest point where it passes through a roof of a building and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet. A chimney or vent must not extend less than those distances stated above.
A lined chimney is preferred and must be used when required by federal, provincial, territorial, state or local building codes. Vitreous tile linings with joints which prevent the retention of moisture and linings made of
Cold masonry chimneys, also known as outside chim- neys, typically have one or more walls exposed to outside air.
When any atmospheric
1.Line chimney with
2.Provide drain trap to remove any condensate.
Inspect existing chimney or vent before installing boiler. Failure to clean or replace perforated pipe or tile lining will cause severe injury or death.
Do not alter boiler draft hood or place any obstruction or
Where two or more gas appliances vent into a common chimney or vent, equivalent area should be at least equal to the area of the vent outlet on the largest appliance plus 50 percent of the area of the vent outlet on the ad- ditional appliance(s).
When removing boiler from common venting system
Failure to follow all instructions listed below can cause flue gas spillage and carbon monoxide emissions, resulting in severe personal injury, death or substantial property damage.
At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in op- eration, while the other appliances remaining connected to the common venting system are not in operation.
a.Seal any unused openings in the common venting sys- tem.
b.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.
c.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.
d.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.
e.Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe.
f.After it has been determined that each appliance remain- ing connected to the common venting system properly vents when tested as outlined above, return doors, win- dows, exhaust fans, fireplace dampers, and any other gas- burning appliance to their previous conditions of use.
g.Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code,ANSI
Canadian installations must comply with CAN/CSA B149.1 or B149.2 Installation Code.
Part Number
