Desa H) Owner's Operation And Installation Manual page 9

VENTING INSTALLATION
Continued
Vent terminations must be located in accordance with height and
proximity rules of NFPA No. 54 or CAN/CGA B149. These rules
apply to vents at 12 in. diameter or less and require a minimum
height in accordance with the roof pitch and a minimum of 8 ft.
distance from a vertical wall or obstruction (see Figure 11).
If venting horizontally through a side wall becomes necessary, a
listed thimble approved for use with B-type vent must be used. Check
with your local codes before venting through a side wall.
Some codes areas allow the use of existing B-type vent systems if
the system is at or above the recommended diameter of the flue;
in this case 6".
The flue connection must be made using listed B-type connectors
and the existing system must be code inspected for damage and
proper installation.
It is not recommended that this appliance be common vented with an
existing gas burning appliance. However, if it becomes necessary to
common vent this appliance, the venting system must be sized and
configured in accordance with the common venting guides Appendix
G of the current National Fuel Gas Code ANSI Z223.1/NFPA 54
and in Canada with CAN/CGA B149.
Note: Before connecting this appliance to an existing vent system
or a common venting system consult with your local architect,
planner or building official.
Lowest
Listed
Discharge
Vent Cap
Opening
8 Ft. Min.
Listed Gas
Vent
H (Min)
Height
From Roof
Roof Pitch
Flat to 6/12
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Figure 11 - B-Vent Terminations
For more information, visit www.desatech.com
108795-01M
x
12
Roof Pitch x/12
Listed Clearance
H (Min.) Ft. m
1.0 0.30
1.25 0.38
1.5 0.46
2.0 0.61
2.5 0.76
3.25 0.99
4.0 1.22
5.0 1.52
6.0 1.83
7.0 2.13
7.5 2.27
8.0 2.44
WARNING: This appliance must be properly con-
nected to a system and must not be connected to a
chimney flue servicing a separate solid fuel burning
appliance.
CHECKING FOR PROPER VENTING
After completing and checking the electrical, gas and vent connec-
tions, follow the lighting instructions and allow the main burner to
run for approximately 5 minutes. Hold a lighted match or cigarette
near the top edge of the fireplace opening and play it along the entire
length of the opening (see Figure 12). Proper venting should tend
to draw the flame or smoke into the appliance. Improper venting
or escaping of spillage of burned gas, is indicated when the match
flickers or goes out. Smoke from a cigarette will also tend to disperse
away from the appliance.
If the appliance is found to be improperly venting, shut it off and
notify your installer or a qualified service agency to inspect the
venting system.
NOTICE: This appliance is equipped with a vent safety
shutoff switch which will shut down the appliance in
the case of a venting problem. Do not bypass the vent
safety switch. If the appliance should shut down, contact
a qualified installer, service agency or your gas supplier
to have the vent inspected before operating.
Check this area along
the entire top edge of the
fireplace opening. Smoke
or flame should be drawn
into the appliance opening.
Figure 12 - Checking for Spillage
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