5
C. Table - Air Distribution Duct Sizing & Design
Return Air Grille Kit
3105007.XXX
3105935.XXX
Roof Cavity Depth 2.0 In. Min. - 5-1/2 In. Max.
Duct Cross Sectional Area 21.0 Sq. In. Min.
Duct Size
Depth
Width
Total Duct Length
Duct Length (short run)
1-1/2 In. Min. - 2-1/2 In. Max.
7.0 In. Min. - 10.0 In. Max.
15.0 Ft. Min. - 40.0 Ft. Max.
1/3 Total Duct Length
Register Requirements per A/C Unit
Number Required
Register Free Air Area
Distance From Duct End
Distance From Elbow
4 Min. - 8 Max.
14.0 Sq. In.
5.0 In. Min. - 8.0 In. Max.
15.0 In.
Total System Static Air Pressure
Blower at High Speed,
Filter & Grille In Place
0.12 - 0.65 In. W.C.
SPECIFICATIONS
INSTALLATION INSTRUCTIONS
A. Choosing Proper Location For Unit
This unit is specically designed for installation on the roof
of an RV. When determining your cooling requirements, the
following should be considered:
● Size of RV;
● Window area (increases heat gain);
● Amount of insulation in walls and roof;
● Geographical location where the RV will be
used;
● Personal comfort level required.
1. For one unit installation: The unit should be
mounted slightly forward of center (front to back)
and centered from side to side.
2. For two unit installations: Install one unit 1/3 and
one unit 2/3’s from front of RV and centered from
side to side.
It is preferred that the unit be installed on a relatively at
and level roof section measured with the RV parked on a
level surface. See table below for maximum acceptable tilt.
Model Number Max Tilt
641815
641816
641835
651815
651816
8°
3. After Location Has Been Selected:
a. Check for obstructions in the area where unit
will be installed. See (FIG. 1) & (FIG. 2).
FIG. 1
9-1/2″
Front
Center Line Of Unit
Dimensions Are Nominal
29″
40″
4″
4″
12″
Model
641815
641816
641835
651815
651816
Keep These Areas
Free Of Obstructions
Roof
Opening
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