Heatilator GNBC30 - Page 8

28466 Rev H 8 01-02
NOVUS B-VENT INSTALLATION INSTRUCTIONS
Roof Pitch H (Min.) Ft.
Flat to 6/12 ................................................ 1.0
6/12 to 7/12 ............................................... 1.25
Over 7/12 to 8/12 ...................................... 1.5
Over 8/12 to 9/12 ...................................... 2.0
Over 9/12 to 10/12 .................................... 2.5
Over 10/12 to 11/12 .................................. 3.25
Over 11/12 to 12/12 .................................. 4.0
Over 12/12 to 14/12 .................................. 5.0
Over 14/12 to 16/12 .................................. 6.0
Over 16/12 to 18/12 .................................. 7.0
Over 18/12 to 20/12 .................................. 7.5
Over 20/12 to 21/12 .................................. 8.0
Figure 7
Vent Height for Vertical Termination
5. CHECK VENTING SYSTEM
Check the venting system to assure proper operation.
This can be done with a match while the appliance is
operating.
Hold a lighted match at the bottom edge of the draft
hood opening. If the flames and smoke remain upright,
ventilation is acceptable. If the flames and smoke are
drawn into the draft hood, this means ventilation is
good. If the flames and smoke are forced away from
the draft hood, this may indicate a ventilation blockage
or down draft resulting in gas spillage into the home.
If this occurs, turn off the appliance and do not burn it
until it has been inspected by a qualified service
person. See Figure8.
Table 1
Vent Height
6. INSTALLING AN OUTSIDE AIR KIT
(STRONGLY RECOMMENDED)
An AK14 Outside Air Kit should be purchased as a
feature with this appliance. An outside air kit helps to
decrease the amount of room air taken by utilizing
outside air for combustion. Figure 9 illustrates two of
many possible methods that can be used to supply
outside air to the appliance.
A maximum of 40 of air kit ducting is allowed. The air
kit must terminate at least three feet below the venting
termination and must terminate to the outside.
Figure 8
Testing Ventilation
WARNING!
Exhaust products of gasoline engines are
hazardous. The outside air must not be taken from a
garage space, attic spaces, basements or above
the roofing where other heating appliances, fans or
chimneys exhaust or utilize air.
Note: The outside air kit can terminate at any level with
the exception that it must terminate at least one foot
below the chimney termination cap.