Oil Furnace Chimney Liner Sizing

The combustion of fuel from an oil furnace creates a corrosive by product of unburned carbon and sulfur commonly known as soot.

Oil furnace chimney liner sizing. The hot and buoyant flue gases will remain hot exit the flue quicker cool less and be much less likely to condense on the chimney or liner walls. Remember that once a chimney liner is installed in an oil furnace chimney flue that you must maintain it annually. The flue and chimney sizing not only controls the exhaust of combustion by products but also has a direct effect on the burner s air supply. 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.

Reline your oil furnace chimney flue with the best chimney liner available today. According to hvac condensation builds inside of vents promoting deterioration of the furnace. Without a stainless steel. Here is a quick guide to the umc s chimney sizing btuh venting capacity tables when sizing a metal or masonry chimney diameter to match the total input btuh of the heating appliances boiler furnace water heater being vented.

Which chimney sizing table to use. 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. Clay or tile flue liners help with proper evaporation. 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. Properly sizing a chimney liner will greatly reduce condensation within the venting system. Reline your chimney with a flex king chimney liner. Next measure the exact inside flue measurement that you will be installing the liner down.

This will tell you if the correct size liner will fit down your flue. Both gas and oil furnaces use masonry chimney flue vents that handle a temperature range from 350 f to 1800 f degrees. For example if it has a 6 opening where the pipe is to be inserted that is the ideal size liner you need. When the draft of the appliance rises the fan wheel of the burner moves air easier.

A guide to chimney sizing tables for venting heating appliances. As the draft on the appliance drops the fan wheel must work harder to move the same amount of air.