Dometic 3312024 series Specifications download pdf (Page 6)

• Duct size

• Duct layout

• Register size

• Register location

• Thermostat location

• Indoor Temperature Sensor Location

These items must be determined in conjunction

with the Air Distribution Duct System Sizing and

Design Requirements listed in the chart below.

Important: Alternate congurations and methods may

be used which still allow the unit to operate properly;

however, these alternate congurations and methods

must be approved by Dometic, LLC in writing. The fol-

lowing instructions are based upon the use of Return

Air Grill Kits 3105007.XXX & 3105935.XXX

Air Distribution Duct Sizing & Design Chart For Ducted Applications

Return Air Grill 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

Number Required Per Run

Distance From Duct End

Distance From Elbow

4 Min.

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 & Grill In Place

0.55 - 0.90 In. W.C. 4579 Series

0.40 - 1.10 In. W.C. 4591 & 4595

Note: Duct sizes listed are inside dimensions.

Duct Size And Requirements For 3105007.XXX And 3105935.XXX Return Air Grill

Total Outlet Air Area

Minimum 21.0 Sq. In.

Roof

Rafters

Note: Duct Size is Inside Dimensions

Short Duct Run Minimum

1/3 Total Duct Length

Ducts Min. Max.

Depth 1-1/2" 2-1/2"

Width 7.0" 10.0"

Total Length 15.0' 40.0'

14-1/4" x 14-1/4" (± 1/8")

Roof Opening

Registers

8 Min. - 12 Max.

(Per Unit)

14 Sq. In. Free

Area Per Register

FIG. 5

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Dometic 3312024 series Specifications Page 6

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