Types of Vents for an Oil Furnace

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The function of vents is releasing gases while the oil furnace converts the oil to heat for the home. Proper maintenance of vents prevents long-term damage to the system. Following building code requirements for placement of the different types of vents is crucial to minimize potential dangers and damage to properties.


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Masonry Chimney Flue Vents

Both gas and oil furnaces use masonry chimney flue vents that handle a temperature range from 350 F to 1800 F degrees. According to HVAC, condensation builds inside of vents promoting deterioration of the furnace. Clay or tile flue liners help with proper evaporation. Condensation build-up in the chimney area causes many homeowners to mistakenly presume there is roof leakage. The actual leakage is from the masonry chimney flue structure.

Type L Vents

Type L vents are popular because they handle up to 1000 F degrees of temperature. Many homes use the Type L vents for the newer and more energy efficient oil burning furnaces. It is imperative to place L Vents under the proper government specifications to prevent home roof fires. According to the International Code Council, install Type L vents a minimum of two feet higher than anything inside a 10 foot radius of the chimney.


Single-Wall Metal Flue Vents

Another type of venting system for an oil furnace is single-wall metal flue vent pipes. A pipe and appropriate connectors run from the actual furnace unit out of the home for venting. According to the International Code Council, clearance area for this type of oil furnace venting is nine inches. Some models of single-wall metal flue vents need as much as 36 inches for proper fire safety clearance. Many states' building codes require a minimum of 18 inches for clearance between the single-wall metal flue vents and combustible materials.