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When using as a vented log set, refer to chart below to calculate minimum damper opening.
FOR MASONRY BUILT FIREPLACES FREE OPENING AREA OF CHIMNEY
DAMPER FOR VENTING COMBUSTION PRODUCTS FROM DECORATIVE
APPLIANCES FOR INSTALLATION IN SOLID FUEL BURNING FIREPLACES.
APPLIANCE INPUT RATE (Kbtu/Hr)
20 30 40 50 60 70 80 90 100 110 120
Chimney Minimum Openings** ( sq. in. )
Height* (ft)
6 17.6 25.7 33.8 41.7 49.2 56.6 64.0 71.4 78.8 86.2 93.5
8 16.5 23.7 31.2 38.7 45.5 52.4 59.7 66.9 74.1 81.3 88.6
10 15.1 21.7 28.7 35.2 41.7 48.2 54.3 60.2 66.1 72.0 77.9
15 14.1 19.9 26.1 32.0 37.7 43.2 48.8 54.1 59.4 64.6 69.9
20 12.9 18.5 23.7 28.8 34.3 39.8 44.4 49.1 53.8 58.4 63.0
30 12.2 16.9 21.6 26.5 31.2 35.9 40.3 44.5 48.6 52.7 56.6
*Height is from hearth to top of chimney and the minimum height is 6 feet.
**Chart shows minimum opening (sq. in.) for a given height and input rate.
(7) See: GAS PRESSURE CHECK, page 8.
(8) See: OPERATING INSTRUCTIONS, pages 9-12.
(9) See: BURNER & PILOT FLAME CHECK, for proper flame pattern, page 13.
(10)See: CLEANING INSTRUCTIONS, page 13-25.
NOTE: Visually check the pilot and burner flames annually, and monthly during seasons
that the appliance is operating frequently. See page 13.
NOTE: “The installation of appliances designed for manufactured home (US only) or mobile
home installation must conform with the Standard CAN/CSA Z240 MH, Mobile Housing, in
Canada, or with the Manufactured Home Construction and Safety Standard, Title 24 CFR,
Part 3280, in the United States, or when such a standard is not applicable, ANSI/NCSBCS
A225.1/NFPA 501A, Manufactured Home Installations Standard.
WAR N I N G: “Do not use this appliance if any part has been under water. Immediately call
a qualified service technician to inspect the appliance and to replace any part of the control
system and any gas control which has been under water.”
WAR N I N G : “ Keep the appliance area clear and free from combustible materials, gasoline
and other flammable vapors and liquids.”
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