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This guide is a compilation of the system design and application procedures for all Hart & Cooley Gas Venting and Chimney products. The first section is specifically devoted to the design of Double-Wall Type B Gas Vent Systems for use with equipment certified by the American Gas Association or Canadian Gas Association.
In this guide, we will walk you through the basics of furnace venting, including natural vents, flue pipe, combustion air, and exhaust pipe, and why they are crucial for efficient heating in your home. Proper venting is essential for optimal performance and safety of your furnace installation.
This guide covers single and multiple appliance venting and proper chimney sizing. It has a complete set of easy-to-use sizing tables, the same tables used in the National Fuel Gas Code. Included in the guide are common definitions, examples, tips on what you should and should not do and many illustrations to help you along the way.
SIZING HANDBOOK & APPLICATION GUIDE Chimney & Gas Vent For Capacities to 100 Million B.T.U. The primary aim of this Sizing Handbook is to provide more detailed guidance on appliance venting than can be found in the codes or in appliance manufacturers' instructions. It is intended for the convenience and assistance of
Direct vent exhaust clearance distances for gas fueled appliances: Table & illustrations of the required space between a direct or side-wall vent for a gas fired heating appliance and building windows, doors, corners, gas meter, air intakes, sidewalks, balconies & decks and other building features.
At no time should a venting system for a listed Category II, III, or IV central furnace be sized with these tables. The National Fuel Gas Code (NFPA 54/ANSI Z223.1-1988) may also be used to size venting systems for drafthood equipped central furnaces.
Single versus two-pipe venting. High efficiency furnaces can use either single or two-pipe venting setups: A single-pipe (central) furnace uses indoor air for combustion air intake. A two-pipe (direct-vent) furnace has an intake pipe that draws in outside air for combustion air.
DuraVent BVO oval vent pipe, sizes 4”, 5” and 6” provides the venting capacity of 4”, 5” and 6” round vent pipe. 4” is Listed for both Type B, and Type BW, use/installation in a 2 x 4 wall. 5” is Listed for Type B use/installation in a 2 x 4 and 2 x 6 wall. 6” is Listed for Type B use/installation in a 2 x 6 wall.
It has all the relevant tables to help you determine the ideal vent sizes for all types of gas furnaces. Generally, the sizing requirements depend on the type of furnace (natural venting or fan-induced) and the size of the furnace in BTUs.
First of all, venting must be planned in order to be sized properly. Depending on the BTU rating, length, number of elbows in the run, the size will vary, typically from 1½ to 3-inch pipe in residential. Every manufacturer has its own vent sizing charts. Read the manual, don’t guesstimate. Use the proper tools when installing plastic venting.