22
30484 Rev Q
09/04
MAXUS DIRECT VENT HEATER
e.
Chase/Termination Installation
Figure 31 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,
buildings, adjoining roof lines, adverse
conditions, etc. may create a need for a taller vent
should down drafting occur.
Figure 32 shows minimum clearances to
termination caps in a chase.
Figure 31
Vent Height for Vertical Termination
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
Note
:
To ensure proper operation, verify all vent-
ing and the termination are unobstructed.
ROOF PITCH
Figure 32 - Multiple Vertical Termination