Category 1 Vent Pipe

Kits in this category include those designed for natural draft appliances using gas oil or wood.

Category 1 vent pipe.

Ul 1738 standard special gas vent for category ii iii iv appliances 6. All horizontal runs of vent pipe must rise 1 4 inch per foot of run to maintain proper draft in the vent. You should also limit the length of the horizontal flue pipe. 1 avoid an excessive number of turns and bends figure 5 and 2 maximize rise.

That code may also be used to size venting systems for drafthood equipped central furnaces or for fan assisted combustion system central furnaces. The venting tables within this booklet have now been included in the national fuel gas code nfpa 54 ansi z223 1 1999. A category i vent system works by allowing heated flue products to rise vertically so the vent pipe must rise vertically from the boiler vent connection as soon as possible. Double wall type b gas vent for approved category i natural gas or propane fired appliances gas furnaces heaters fireplaces and boilers in accordance with nfpa 211 standards for chimneys fireplaces vents and solid fuel burning appliances and nfpa 54 the national fuel gas code.

In some cases transrite has been used which may contain asbestos. Ul 103 standard building heating appliance chimney canada. Ambient temperature two ambients must be considered. Vent connectors shall not be upsized more than two sizes greater than the listed appliance categorized vent diameter flue collar diameter or draft hood outlet diameter.

Masonry will use vitreous clay liner. The amerivent all metal double wall gas vent is listed as type b by underwriters laboratories inc. Category i vent materials are found with older appliances. Ul 103 standard building heating appliance chimney swkl vt 5.

In other words in a category i venting system if. As well as those suitable for category i gas fired appliances with b vent or appliances with a draft hood. Gama venting tables for category i central furnaces. Ul 1738 standard special gas vent for category ii iii iv appliances 2.

Category i is defined as a gas heating appliance with a flue loss equal or greater than 17 non condensing with a negative vent static pressure. Ul 441 standard type b gas vent 4. Ameri vent chimney liner kits are designed to allow you to easily line masonry chimneys. Single wall galvanized pipe 26 gauge is only used as a connector on 70 percent afue and lower gas appliances and all oil appliances.

Ul 641 standard type l vent 3. As stated earlier heat loss through the vent pipe walls can take away from the draft force. Venting guidelines for category i gas appliances single appliance vent tables 1 and 2 continued 10.