20
30803 Rev X
08/04
CALIBER DIRECT VENT INSTALLATION INSTRUCTIONS
e.
Chase/Termination Installation
Figures 45 and 46, and Table 1 specify minimum vent heights for various pitched roofs.
These vent heights are necessary for safety and do not ensure draft-free operation. Trees, building, adjoining
roof lines, adverse conditions, etc. may create a need for a taller vent should down drafting occur.
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
Table 1 - Vent Height
Figure 46 - Multiple Vertical Terminations
Figure 45 - Vent Height for Vertical Termination
1. High Altitude Installation
For U.S. installation, appliances are tested and approved for elevations from 0-2000 feet. When installing this
appliance at an elevation above 2000 feet, National Fuel Gas Codes require a decrease of the input rating by
changing the existing burner orifice to a smaller size. Input should be reduced 4% for each 1000 feet above sea
level. Check with the local gas utility for proper orifice size identification. The correct orifice is available from your
Heatilator distributor.
For Canada, appliances are certified for elevations from 0-4500 feet. When installing this appliance at an elevation
between 0-4500 feet in Canada, the input rating does not need to be reduced. When installing this appliance at an
elevation above 4500 feet in Canada, check with local authorities.
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