10
VENTING
WARNING | Failure to follow all instructions can result in flue gas spillage and carbon monoxide |
emissions, causing severe personal injury or death. All chimneys must meet the requirements of NFPA 211 and NFPA 31
Chimney
The boiler must be connected to an adequate chimney or an approved venting system in accordance with these instructions. An adequate chimney or venting system is one that is sealed and lined with the capability of producing a
Masonry and metal chimneys shall be constructed in accordance with applicable building code requirements. Masonry chimneys shall be lined with an approved clay tile liner or a listed chimney lining system installed in accordance with manufacturers’ instructions and also meeting the requirements of
Prior to installation of the boiler, the chimney or venting system shall be examined by the installer and determined to be in good condition. All joints of the chimney must be tightly sealed. The inside of the chimney should be free of all obstruction, such as loose brick, broken pieces of tile, or corroded metal. If chimney flues are divided or there are multiple flues within one chimney, make sure there are no openings in the partition separating the divided or individual flues. When a new appliance is connected to an existing chimney, that chimney shall be brought up to current requirements. Chimneys which are relined shall be done so with an approved liner that will resist corrosion, softening, or cracking from the flue gasses.
All chimney
The inside area of the chimney liner should equal, at a minimum, the area of the vent pipe exiting the furnace. If more than one appliance is installed, the area of both appliances shall be used in determining the required inside area of the chimney.
The flue gas exit of a chimney shall be at least 3 feet above the highest point where it passes through the roof of a building and at least 2 feet higher than any portion of a building within 10 feet of such chimney.
The chimney height will also be determined by the height of the surrounding trees, buildings and terrain. When chimney downdraft conditions cause faulty operation that creates a hazard, corrective steps must be taken.
When altering the surrounding obstructions is not possible, a chimney cap can be constructed on the top of the chimney to avoid downdrafts. The chimney cap should be pyramid shaped on the top with a perfectly flat surface immediately above the chimney outlet. The hood should be attached by four (4) iron supports. The four iron supports should be equal in height to the width of the chimney opening. Four plates, flaring down, can be added to help insure that the wind will pass straight over the chimney outlet.
Chimney Relining
A tile lined masonry chimney serving an oil fired boiler should comply with applicable building codes such as