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G. Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the fireplace 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.
Hearth & Home Technologies • Grand Oak Match Light Gas Log Sets • 4004-300 Rev F • 1/2011
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)*
GO318
10
not approved
15
38.5
20
31.2
25
27.3
30
24.6
35
22.1
40
20.4
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)*
GO318
6
64
8
59.7
10
54.3
15
48.8
20
44.4
30
40.3
* Height is measured from the hearth to the top of the chimney.
Minimum height is 6 ft.
Table 3 for Minimum Fireplace Dimensions
Front
Log Set
Opening
Depth
GO24
32 in.
20 in.
GO30
38 in.
20 in.
GO318
32 in.
23 in.
GO324
34 in.
23 in.
GO330
40 in.
23 in
WARNING
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 flue gases before
appliance is used.
Fire needs to draft properly for safe
operation.
GO 24 & 324
GO 30 & 330
not approved
not approved
38.5
45.4
31.2
37.4
27.3
31.2
24.6
28.3
22.1
25.5
20.4
23.8
GO 24 & 324
GO 30 & 330
64
71.4
59.7
66.9
54.3
60.2
48.8
54.1
44.4
49.1
40.3
44.5
Rear
Height
Width
18 in.
21 in.
18 in.
27 in.
22 in.
21 in.
22 in.
22 in.
22 in.
29 in.
Natural
BTU
73,000
80,000
77,000
86,000
86,000
5
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