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Hearth & Home Technologies • Grand Oak Match Light Gas Log Sets • 4004-300 Rev C • 12/05
5
Asphyxiation Risk
This appliance produces carbon monoxide
(CO).
• The free opening areas (in square inches)
of the chimney damper as shown in the
following tables must be met.
• User must make sure damper is locked
open.
• The installer is responsible to ensure
proper ventilation of fl ue gases before
appliance is used.
Fire needs to draft properly for safe
operation.
WARNING
G. Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the fi replace to operate properly. Causes for this
imbalance include:
• Exhaust fans (kitchen, bath, etc.).
• Range hoods.
• Combustion air requirements for furnaces, water heaters
and other combustion appliances.
• Clothes dryers.
• Location of return-air vents to furnace or air
conditioning.
• Imbalances of the HVAC air handling system.
• Upper level air leaks: recessed lighting, attic hatch
opening, duct leaks.
Table 1 for Factory Built Fireplaces
Free Opening Area (in square inches) of Chimney Damper for
Venting combustion Products from Decorative Appliances for
Installation in Solid Fuel Burning Fireplaces.
Chimney Ht.
(Feet)*
24 in. Log Set
Natural Gas
30 in. Log Set
Natural Gas
10 not approved not approved
15 38.5 45.4
20 31.2 37.4
25 27.3 31.2
30 24.6 28.3
35 22.1 25.5
40 20.4 23.8
Table 2 for Masonary Built Fireplaces
Free Opening Area (in square inches) of Chimney Damper for
Venting combustion Products from Decorative Appliances for
Installation in Solid Fuel Burning Fireplaces.
Chimney Ht.
(Feet)*
24 in. Log Set
Natural Gas
30 in. Log Set
Natural Gas
6 64 71.4
8 59.7 66.9
10 54.3 60.2
15 48.8 54.1
20 44.4 49.1
30 40.3 44.5
* Height is measured from the hearth to the top of the chimney.
Minimum height is 6 ft.
Table 3 for Minimum Fireplace Dimensions
Log Set
Size
Front
Opening Depth Height
Rear
Width
Natural
BTU
24 32 in. 15 in. 18 in. 21 in. 73,000
30 38 in. 15 in. 18 in. 27 in. 80,000