Air Distribution System Sizing And Design; Air Distribution Duct Sizing And Design Chart - Dometic 57908.321 Installation Instructions Manual

The Installer of this air conditioner/heat pump system must design the air distribution system for their particular application. Several
requirements for this system MUST be met for the air conditioner/heat pump to operate properly. These requirements are as
follows:
A. The duct material must meet or exceed any agency or RVIA Standard that may be in existence at the time the RV is produced.
B. All discharge air ducts must be properly insulated to prevent condensation from forming on their surfaces or adjacent surfaces
during operation of the air conditioner/heat pump. This insulation must be R-7 minimum.
C. Ducts and their joints must be sealed to prevent condensation from forming on adjacent surfaces during operation of the air
conditioner/heat pump.
D. Return air openings must have 40 square inches minimum free area including the filter.
E. Return air to the air conditioner/heat pump must be filtered to prevent dirt accumulation on air conditioner/heat pump cooling
surface.
Return Air Cover Model
Roof Cavity Depth
Duct Cross Sectional Area
Duct Size
Depth
Width
Total Duct Length
Duct Length (short run)
Register Requirements
Number Required Per Run
Register Free Air Area
Distance From Duct End
Distance From Elbow
Total System Static Air Pressure
Blower at High Speed,
Filter & Grill In Place
Note: Duct sizes listed are inside dimensions.
INSTALLATION INSTRUCTIONS DUCTED CCC
4. AIR DISTRIBUTION SYSTEM
SIZING & DESIGN
!
It is the responsibility of the installer to in-
sure the ductwork will not collapse or bend
during and after the installation. Dometic
Corporation will not be liable for roof struc-
tural or ceiling damage due to improperly in-
sulated, sealed or collapsed ductwork.
AIR DISTRIBUTION
DUCT SIZING & DESIGN CHART
3105007.XXX
3105935.XXX
2.0 In. Min. - 5-1/2 In. Max.
21.0 Sq. In. Min.
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
14.0 Sq. In.
5.0 In. Min. - 8.0 In. Max.
0.55 - 0.90 In. W.C. 579 Series
0.40 - 1.10 In. W.C. 590, 591, 595 Series 0.40 - 1.10 In. W.C. 590, 591, 595 Series
0.12 - 0.65 In. W.C. 600, 630 Series
CAUTION
4 Min.
15.0 In.
6
3308120.XXX
Genesis Air Filtration System
2.0 In. Min. - 5-1/2 In. Max.
32.0 Sq. In. Min.
2.0 In. Min. - 2-1/2 In. Max.
8.0 In. Min. - 10.0 In. Max.
15.0 Ft. Min. - 40.0 Ft. Max.
1/3 Total Duct Length
4 Min.
14.0 Sq. In.
5.0 In. Min. - 8.0 In. Max.
15.0 In.
0.55 - 0.90 In. W.C. 579 Series
0.12 - 0.65 In. W.C. 600, 630 Series