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From inside (document excerpt):
HEATING & COOLING GAMA Venting Tables VENTING TABLES CATEGORY I CENTRAL FURNACES 1990 GAS APPLIANCE MANUFACTURERS ASSOCIATION 7507-183 REVISED: JULY, 1991 This document was created with FrameMaker 4.0.4 NOTICE When using Venting Tables Category I Central Furnaces supplement furnished with this Installation Instruction package, use the Terms table below to explain American terminology which differs from Canadian.
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TERMS AMERICAN TERM Category I Central Furnaces CANADIAN TERM AND DEFINITION In Canada, this type of furnace is a conventionally vented (vertical natural draft) furnace without a drafthood. National Standard of Canada, CAN/CGA.B149 Installation Code National Fuel Gas Code-NFPA 54/ANSI Z223. 11992 Section III. General Venting Requirements: Item 8 of this section applies only to United States instructions. Figures 1 and 2 should not be used as a reference for vent termination in Canada. Use the procedures established by local authorities or in the absence of local authorities, those set by the CAN/CGA.149 Installation Code. GAMA VENTING TABLES FOR CATEGORY I CENTRAL FURNACES This booklet contains new venting tables designed specifically for use with Category I central furnaces. These tables are unique, in that, industry wide venting tables now exist for fan-assisted combustion system central furnaces. Venting tables for these types of appliances are not contained in the National Fuel Gas Code (NFPA 54/ ANSI Z223.1-1988). All requirements contained in this booklet apply to both Category I drafthood equipped central furnaces as well as fan-assisted combustion system central furnaces. 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. However, at this time, the National Fuel Gas Code does not include alternate sizing methods for fan-assisted combustion systems. Therefore, until engineering data is developed to allow alternate sizing methods for Category I fan-assisted central furnaces, the enclosed venting tables must be used for fan-assisted combustion system central furnaces. These tables apply to venting single appliances and common venting multiple appliances in both metal and masonry chimneys. The new venting tables were developed by Battelle under contract (GRI-5088-245-1728) to the Gas Research Institute (GRI). The computer program (VENT-II) developed by Battelle Columbus generated the venting tables in this booklet and this procedure has been accepted by the American Gas Association Laboratories as an appropriate engineering methodology for determining venting requirements of Category I central furnaces. For your information, the general venting requirements listed in this booklet are not intended to be used as complete installation instructions and represent only a partial list of venting considerations. For venting applications that fall outside the parameters of the new venting tables, refer to the furnace manufacturer’s complete installation instructions, the specific vent manufacturer’s complete installation instructions, and state and local codes.