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2. Using the roof opening as a guide, cut a matching hole in the
ceiling.
NOTE: Maintain structural integrity. Otherwise damage to
product and/or RV could occur. Always observe the following
guidelines while structuring the opening.
Do not cut
roof structure
or rafters
Air Distribution Duct Sizing and
Design
The installer of this system must design the air distribution
system for their particular application.
NOTE: Make sure ductwork will NOT bend or collapse during
and after installation, and that it is correctly insulated and
sealed. Otherwise, damage to roof structure and ceiling could
occur.
The following requirements must be met for properly operate
the unit:
Roof Cavity
3"-6" (75mm-152mm)
Depth
Duct Cross
21 Sq. In. Min.
Sectional Area
Depth
Width
Duct Size
Total Duct
Length
Duct Length
(short run)
Number
Required
Supply
Register
Free Air
Area
Register
Return
Requirements
Register
per A/C Unit
Free Air
Area
Distance
From Duct
End
Distance
From Elbow
Blower at
Total System
High Speed,
Static Air
Filter &
Pressure
Grille In
Place
Good: rafters
Good: location
supported by
between roof
cross beams
rafters
11/2" Min. - 21/2" Max. (38mm Min. - 63.5mm
Max.)
7" Min. - 10" Max. (178mm Min. - 254mm
Max.)
15Ft. Min. - 40Ft. Max. (4.5m - 13m)
1/3 Total Duct Length
3 Min. - 8 Max.
14 Sq. In. (90 sq. cm)
40 Sq. In. (258 sq. cm)
5" Min. - 8" Max. (127mm Min. - 203mm
Max.)
15" (381mm)
0.55 - 1.10 In. W.C.
3. The opening created must be framed to provide adequate
support and prevent air from being drawn from the roof
cavity.
4. Lumber
3/4
" or more in thickness must be used. Remember
to provide an entrance hole for power supplies, wall thermostat
and furnace wiring for connections. Leave 15" (381mm)
minimum at the front of the opening.
3/4" Minimum
thickness
• Properly insulate and seal all discharge air ducts to prevent
condensation from forming on their surfaces or adjacent
surfaces during operation of the unit. This insulation must be
R-7 minimum.
Duct
(TOWARD BACK OF RV)
Roof
Duct
• Return air openings must have 80 square inches (516 square
centimeters) minimum free area including the filter.
• Return air to the unit must be filtered to prevent dirt
accumulation on the unit cooling surface.
- 7 -
Leave access for
power supply wiring
TOP VIEW
(BACK OF RV)
Frame
Duct
Roof
Opening
Frame
Frame
SIDE VIEW
Roof Opening
Ceiling
CCD-0008919 Rev: 07.30.24
Duct
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