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MUA-PRC001-EN40
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ETL Labeling Requirements
A DFOA unit with no mixing box,
motorized RA damper, or motorized
75/25 damper can bear the ETL label if:
1
The unit SCFM is less than the
Maximum SCFM given below.
2
The unit input is less than the Maximum
BTUH rating given below.
3
The unit temperature rise is less than the
Maximum Temperature Rise given
below.
4
The fuel is natural gas.
5
The motor is a single speed motor.
6
Unit components are standard (there are
exceptions to this).
ETL Labeling Requirements
A DFOA unit with a mixing box,
motorized RA damper, or motorized
75/25 damper can bear the ETL label if:
1
The unit SCFM is less than the
Maximum SCFM given below.
2
The unit input is less than the Maximum
BTUH rating given below.
3
The unit temperature rise is less than the
Maximum Temperature Rise given
below.
4
The fuel is natural gas.
5
The motor is a single speed motor.
6
Unit components are standard (there are
exceptions to this).
Model Max. Max. Max. Temp.
No. SCFM BTUH Rise
DFOA 109 3,000 291,262 100 F
DFOA 112 4,250 412,621 100 F
DFOA 115 6,000 582,524 100 F
DFOA 118 8,500 680,000 100 F
DFOA 215 12,000 1,349,831 100 F
DFOA 218 18,000 1,800,000 100 F
DFOA 220 26,000 2,924,634 100 F
DFOA 222 31,000 3,100,000 100 F
DFOA 225 46,000 5,174,353 100 F
DFOA 230 64,000 6,400,000 100 F
Model Max. Max. Max. Temp.
No. SCFM BTUH Rise
DFOA 109 3,000 424,565 120 F
DFOA 112 4,250 601,290 120 F
DFOA 115 6,000 848,880 120 F
DFOA 118 8,500 1,202,580 120 F
DFOA 215 12,000 1,697,760 120 F
DFOA 218 18,000 2,546,640 120 F
DFOA 220 26,000 3,678,480 120 F
DFOA 222 31,000 4,385,880 120 F
DFOA 225 46,000 6,508,080 120 F
DFOA 230 64,000 9,054,720 120 F
These requirements were current when this catalog was
printed.
Please contact Technical Support for the most current
data available.
CGA Approval Requirements
A DFOA unit with no mixing box,
motorized RA damper, or motorized 75/
25 damper can bear the CGA label if:
1
The unit SCFM is less than the Maximum
SCFM given below.
2
The unit input is less than the Maximum
Input BTUH given below.
3
The static pressure is in the range given
below.
4
Unit discharge temperature is 75 F
maximum.
5
The ambient temperature is minus 40 F
or greater.
6
The unit has a maximum temperature
rise of 90 F for single blower units and
100 F for double blower units.
7
The unit minimum input rating is 1/25 of
the Max. Input BTUH given below.
8
The fuel is natural gas.
9
The motor is a single speed motor.
10
Unit components are standard (there are
exceptions to this).
Model Static Max. Max. Input.
No. (in W.C.) SCFM (BTUH)
DFOA 109 0-4.0 3,000 325,500
DFOA 112 0-4.0 4,250 461,125
DFOA 115 0-4.0 6,000 851,000
DFOA 118 0-4.0 8,500 922,250
DFOA 215 0-4.0 12,000 1,302,000
DFOA 218 0-4.0 17,000 1,844,500
DFOA 220 0-4.0 26,000 2,821,000
DFOA 222 0-4.0 31,000 3,363,500
DFOA 225 0-4.0 46,000 4,991,000
DFOA 230 0-3.5 64,000 6,944,000
Motorized Outlet Damper
Purpose
To provide a shut-off damper.
Operation
When the fan switch is on, the outlet
damper begins to open. As the outlet
damper approaches the full open
position, a built-in end switch located
inside the damper motor closes. The
closed end switch starts the fan motor.
When the fan switch is turned to the
“off” position, or if there is a power
failure, the outlet damper closes.
Option Includes:
• Damper
• Two position damper motor with built-
in end switch and spring return
• Linkage