Ducts And Dampers Dimensions - PSG CADDY Installation And Operating Instructions Manual

8. DUCTS AND DAMPERS DIMENSIONS

SIMPLIFIED METHOD
DISTRIBUTION SYSTEM
Ducts size (heat)
4 inch outlet reduce by 1"
5 inch outlet reduce by 2"
6 inch outlet reduce by 3"
N.B.: The main duct must be reduced every 2 outlets.
Ducts specifications (heat)
Dimensions Length
4" 10'
5" 10'
6" 10'
DAMPER
For a 4" warm air outlet: 2" x 10" damper
For a 5" warm air outlet: 2" x 12" damper or 4" x 10"
For a 6" warm air outlet: 2" x 14" damper or 4" x 12"
Always by 8" thick
Elbow Average equivalence
o
1 x 90 Max 4,000 Btu
o
1 x 90 Max 6,000 Btu
o
1 x 90 Max 7,000 Btu
WARM AIR SYSTEM INSTALLATION
HOUSE DIMENSIONS
Example: 28 x 40 bungalow: 1,120 sq. ft.
28 x 40 x 8: 8,960 cu. ft. x 1.8 Ch. air/hr:
Exposed walls:
40 + 40 + 28 + 28: 136 x 8: 1,088 cu. ft. x 22:
Number of windows:
12 of 3 x 4: 144 x 60:
Number of doors:
2 x 3 x 7: 42 x 100:
Non-insulated basement: 25%
Insulated basement: 15%
or 54 Btu per sq. ft.
FOR ELECTRIC ELEMENTS 80%:
TO BE ADDED: House 1 1/2 floor = 25%
House 2 floors
BEDROOM (for example: 12 x 12)
12 x 12 x 8: 1,152 cu. ft. x 1.8 Ch. air/hr:
Exposed walls:
12 + 12 x 8: 192 x 22:
Windows:
3 x 4 x 60
16,128 Btu
23,936 Btu
8,640 Btu
4,200 Btu
52,904 Btu
7,906 Btu
60,840 Btu
48,672 Btu or 14,28 kW
= 40%
2,074 Btu
4,224 Btu
720 Btu
7,018 Btu
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