About Exhaust Fans
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About Sound Levels
Measured in decibels (dB), volume ratings indicate how much noise equipment makes. Some common volume levels include a whisper @ 20 dB, a refrigerator @ 40 dB, a conversation @ 60 dB, and a light machine shop @ 90 dB. OSHA recommends hearing protection for exposure to 80 dB and greater.
Direct-Drive Upblast Roof-Mount Exhaust Fans
Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. These exhaust fans draw stagnant and humid air out through your roof and then expel it up and away from the roof surface. All fans have a disconnect switch to turn off the power for servicing.
Fans with a brushless motor have advanced electronic controls that allow them to precisely operate at wide range of speeds, making them more efficient, quieter, and longer lasting than fans with a standard motor.
Note: Airflow depends on the resistance created by ductwork. This resistance, known as static pressure (SP), is measured in inches of water.
Fans | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Overall | Mounting Bases | |||||||||||||||
| Blade Dia. | Airflow @ Static Pressure | Volume | Motor Speed, rpm | Power, hp | Dia. | Ht. | Base Wd. | Wt., lbs. | Max. Ambient Temp., °F | Housing Material | Specifications Met | Each | Each | |||
Open Dripproof Motor Enclosure | ||||||||||||||||
120V AC, Single Phase—Hardwire | ||||||||||||||||
| 1 | 11 3/4" | 750 cfm @ 1/2 in. of H₂O 1,050 cfm @ 0 in. of H₂O | 59 dBA @ 5 ft. | 1,300 | 1/4 | 25 1/2" | 25 1/4" | 21" | 67 | 300° | Aluminum | AMCA Certified, ETL Listed | 0000000 | 0000000 | 0000000 | 0000000 |
Totally Enclosed Motor Enclosure—Brushless Motor | ||||||||||||||||
120V AC, Single Phase—Hardwire | ||||||||||||||||
| 1 | 11 3/4" | 1,050 cfm @ 1/2 in. of H₂O 1,300 cfm @ 0 in. of H₂O | 70 dBA @ 5 ft. | 1,575 | 1/3 | 25 1/2" | 25 1/4" | 21" | 64 | 300° | Aluminum | AMCA Certified, ETL Listed | 0000000 | 000000 | 0000000 | 000000 |