Nordyne M3RL Series Installation Instructions Manual page 17

Downflow Furnace
Seal/Caulk
Around Pipe
at Building
90˚ Elbow
12"
Min.
Normal Snow Level
Combustion Air
Intake Pipe
5. Avoid areas where condensate drainage
may cause problems by dropping on plant-
ers or patios, etc. Also ensure that ex-
haust gases will not impinge on windows
or building surfaces, which may be com-
promised or damaged by condensation.
Do not install the vent terminal such that
exhaust is directed into window wells,
stairwells, under decks or into alcoves or
similar recessed areas, and do not termi-
nate above any public walkways.
Combustion
Air Intake Pipe
See Vent Table 4
Straps or Other Suitable
Supports at Minimum of
5 ft. Intervals
Coupling
Upward Pitch - 1/4" Per Foot
Wall
Outlet Exhaust Vent
First Support Should be as Close to
Furnace Connection as Possible
Combustion Air
Intake Pipe
Figure 16. Horizontal Venting
Support System
on Vertical Rise
Below Joints
Vent
Figure 17. Vertical Venting
Vent
Top View
Furnace
5'
Combustion Air Intake
Pipe
6. Select the point of wall penetration where
the minimum 1/4 inch per foot of slope up
can be maintained.
! CAUTION:
For optimal performance vent furnace
through wall which experiences the least
exposure to winter winds.
3 9/16"
1 7/8"
Offset with
Vent for Adequate
Dimensional Clearance
Exhaust
Vent
PVC or
ABS pipe
3" x 2"
Reducer
First support should be as
close to furnace as possible
Vent
Upward Pitch
1/4" per foot
17