Method of venting a furnace

Details Method of venting a furnace Method of venting a furnace

1998-06-18

1999-10-26

Bennett, Henry

Heating systems

Air

Furnace

126110R, F24D 500

Patent

active

059712929

ABSTRACT:
An improved furnace is provided which can be field modified to change the pressure drop across the inducer. The pressure drop is modified to accommodate vertical or horizontal venting and adequately lined and inadequately lined chimneys. A first rate of flow of combustion byproducts into the vent system is used when the chimney is adequately lined and a second relatively higher rate of flow is used when the chimney is inadequately lined. The rate of flow is changed by inserting or removing an obstruction in the flow of combustion byproducts. The obstruction could be a tab or choke placed at the inducer outlet or a similar device in the inducer inlet. When the tab is in place the flow of combustion byproducts is reduced. When the tab is removed, the flow rate increases. Alternatively, the inducer inlet could be adjusted to increase or decrease the amount of air flow through the inducer.

REFERENCES:
patent: 4160440 (1979-07-01), Barnickle
patent: 4261326 (1981-04-01), Ihlenfield
patent: 4603680 (1986-08-01), Dempsey et al.
patent: 4660761 (1987-04-01), Bussjager
patent: 5427086 (1995-06-01), Brownell
patent: 5636993 (1997-06-01), Badry
National Fire Protection Association (NFPA) entitled: NFPA 211 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances, 1992 Edition, section 3-1.9.1; section 3-2.2--Category I Gas Applicances.
International Conference of Building Officials entitled: 1997 Uniform Mechanical Code, section 813.2.
National Fire Protection Association (NFPA) entitled: National Fuel Gas Code, 1996 edition, sections 7.5.1; 7.5.3: 7.5.4.
American Gas Association entitled: International Fuel Gas Code, 1997, sections 501.15.1 and 501.15.2, Table 502(3), pp. 127-128, examples 5B and 5C.
Installation, Start-Up, And Operating Instructions--Upflow Gas-Fired Induced-Combustion furnaces (395CAV Series G) (2 pages).
1993 ASHARE Handbook Fundamentals, Table I.

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