09/04
30484 Rev Q
15
MAXUS DIRECT VENT HEATER
Note:
Horizontal runs will require the use of
one vent support (or metal plumber’s strap) for
every 5 ft of vent.
Figure 17
Exterior Wall Hole
(Top Venting)
Figure 18
Exterior Wall Hole
(Rear Venting)
Note:
Exterior wall thickness must be a minimum
of 4 in. to a maximum of 23-1/2 in.
WARNING - RISK OF FIRE!
Always maintain minimum clearances or
greater around the vent system. Do not pack
air spaces with insulation or other material.
d.
Assembling Vent Sections
Attach a straight section, a 45 degree elbow or a
90 degree elbow, depending on your specific
installation.
Figures 17-18 show how to install a typical vent
system. Use only pipe listed for use with this
appliance. See page 5 for a description of listed
components.
If the wall being penetrated is of noncombustible
materials, a 9 in. diameter hole is acceptable.
e.
Installing the Interior Wall Shield
Whenever a combustible wall is penetrated, the
hole must be framed with an interior wall shield
as shown in Figures 19-21. This shield maintains
minimum clearances and restricts cold air
infiltration.
The termination cap height must meet all local
and national codes and not be easily blocked or
obstructed.