A guide to chimney sizing tables for venting heating appliances.
Chimney liner sizing oil.
Sizing tables 12 multiple appliance vents procedure 15 sizing tables 16 additional guidelines 19 multiple story venting sizing guidelines 21 system examples 22 factory built all fuel chimney systems includes flexible stainless liner sizing description 26 sizing tables 27 table of contents.
For hot water heaters and oil furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit.
Boiler heat load and chimney area boiler capacity and chimney area.
Measure from the top of the chimney to the top of the thimble and add 3 5 to accommodate the liner clamping to the top plate.
Air flow and velocity due to natural draft air flow volume and velocity due to stack or flue effect caused by indoor hot and outdoor cold temperature difference.
And a properly fitted chimney.
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.
A ul listed stainless steel flue liner or a ul listed cast in place chimney lining system designed to vent the flue gases of oil fired appliances should be installed.
However the interior of your chimney especially after insulating may not have the adequate space.
Undersized liners will not allow the appliance to vent properly.
This self paced online course covers chimney inspections contracts and warranties fireplace flue sizing oil flue sizing gas flue sizing metal specifications reasons to reline a chimney the importance of a flue liner and why a chimney should be inspected as part of the lining relining process.
Combustion boiler house topics fuels like oil gas coal wood chimneys safety valves tanks combustion efficiency.
A csia certified chimney sweep can properly evaluate size recommend and install the appropriate chimney liner for your home heating equipment.
A properly sized chimney liner protects against fire by providing a proper draft for your furnace thus controlling the amount of heat moving through the chimney.
The rule of thumb for sizing a chimney liner is that you never want it to be smaller than the appliance exhaust hole and you don t want the liner to be three times the area of the exhaust hole of the appliance.
This can cause smoke to pour out of the stove and it can also cause gas and oil appliances to fail.