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.
High-Output Direct-Drive Duct Fans
Produce three times the airflow as standard direct-drive duct fans. All of these direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Also known as axial duct fans, they install inline in ductwork for use as an exhaust, supply, or booster fan. All have a TEFC (totally enclosed fan cooled) motor enclosure, which can be used in dirty, dusty, and damp environments.
Note: Airflow depends on the resistance created by ductwork. This resistance, known as static pressure (SP), is measured in inches of water.
Overall | Mounting | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Duct Dia. | Airflow @ Static Pressure | Volume | Motor Speed, rpm | Power, hp | Dia. | Ht. | Dp. | Bolt Circle Dia. | Max. Temp., °F | Housing Material | Blade Material | Fasteners Included | For Screw Size  | Hole Dia. | No. of Holes | Each | |
120/230V AC, Single Phase—Hardwire | |||||||||||||||||
| 18" | 3,900 cfm @ 3/8 in. of H₂O 4,500 cfm @ 1/8 in. of H₂O | 65 dBA @ 15 ft. | 1,750 | 3/4 | 20 1/16" | 20 1/16" | 20" | 19 1/8" | 100° | Steel | Aluminum | No | 3/8" | 7/16" | 8 | 0000000 | 000000000 |
230/460V AC, Three Phase—Hardwire | |||||||||||||||||
| 18" | 3,900 cfm @ 3/8 in. of H₂O 4,500 cfm @ 1/8 in. of H₂O | 60 dBA @ 15 ft. | 1,750 | 3/4 | 20 1/16" | 20 1/16" | 20" | 19 1/8" | 100° | Steel | Aluminum | No | 3/8" | 7/16" | 8 | 0000000 | 00000000 |
Direct-Drive Hazardous Location Duct Fans
These fans have an explosion-proof motor that is UL listed for Class I, Divisions 1 and 2, Group D; and Class II, Divisions 1 and 2, Groups F and G hazardous environments. All are direct-drive fans that have fewer moving parts than belt-drive fans for less maintenance. Also known as axial duct fans, they install inline in ductwork for use as an exhaust, supply, or booster fan. The fans have a TEFC (totally enclosed fan cooled) motor enclosure, which can be used in dirty, dusty, and damp environments.
Note: Airflow depends on the resistance created by ductwork. This resistance, known as static pressure (SP), is measured in inches of water.
Overall | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Duct Dia. | Airflow @ Static Pressure | Volume | Motor Speed, rpm | Power, hp | Dia. | Ht. | Dp. | Max.Temp., °F | Housing Material | Blade Material | Mounting Fasteners Included | Mounting Hole Dia. | Each | |
120/230V AC, Single Phase—Hardwire | ||||||||||||||
| 18" | 3,900 cfm @ 3/8 in. of H₂O 4,500 cfm @ 1/8 in. of H₂O | 65 dBA @ 15 ft. | 1,750 | 3/4 | 20 1/16" | 20 1/16" | 20" | 100° | Steel | Aluminum | No | 7/16" | 0000000 | 000000000 |
230/460V AC, Three Phase—Hardwire | ||||||||||||||
| 18" | 3,900 cfm @ 3/8 in. of H₂O 4,500 cfm @ 1/8 in. of H₂O | 60 dBA @ 15 ft. | 1,750 | 3/4 | 20 1/16" | 20 1/16" | 20" | 100° | Steel | Aluminum | No | 7/16" | 0000000 | 00000000 |