Oil Furnace Chimney Liner Sizing

According to hvac condensation builds inside of vents promoting deterioration of the furnace.

Oil furnace chimney liner sizing. Does an oil furnace need a chimney liner. For hot water heaters and oil furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit. For example if it has a 6 opening where the pipe is to be inserted that is the ideal size liner you need. It still needs to be cleaned even though there is a stainless steel chimney liner installed.

Properly sizing a chimney liner will greatly reduce condensation within the venting system. 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. 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. However the interior of your chimney especially after insulating may not have the adequate space.

A guide to chimney sizing tables for venting heating appliances. Reline your chimney with a flex king chimney liner. 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. Without a stainless steel.

As the draft on the appliance drops the fan wheel must work harder to move the same amount of air. Clay or tile flue liners help with proper evaporation. When the draft of the appliance rises the fan wheel of the burner moves air easier. This will tell you if the correct size liner will fit down your flue.

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. Which chimney sizing table to use. 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. Remember that once a chimney liner is installed in an oil furnace chimney flue that you must maintain it annually.

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. Next measure the exact inside flue measurement that you will be installing the liner down.