ROOTS™ 621 TRI RAM Blower

Model: 621 TRI-RAM

The ROOTS™ 621 TRI-RAM blower is engineered for industrial systems that demand higher airflow capacity with smooth, controlled performance. Built around proven Roots™ Tri-RAM™ Positive Displacement blowers technology, this unit combines tri-lobed impellers with WHISPAIR™ airflow management for quieter operation and reduced pulsation. Its heavy-duty cast iron construction, precision timing gears, and splash-lubricated bearings help deliver dependable airflow up to 2688 CFM across demanding pressure and vacuum applications.

Key Specifications

Max Flow

2688 CFM

Max Pressure

12 PSI

Maximum Speed

3560 RPM

Manufacturer

Roots

IO&M Manuals

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Technical Details

Model: ROOTS 621 TRI-RAM

Flow Range: Up to 2688 CFM

Max Pressure: 12 psi

Max Vacuum: 16″ Hg

Maximum RPM: 3560

Minimum RPM: 640

Max ΔT: 230˚F

Inlet Connection: 250 mm

Discharge Connection: 200 mm

Shaft Diameter: 50 mm

Drive End Lubrication: Oil

Gear End Lubrication: Oil

Unit Weight: 805 lbs

Roots 621 Tri-RAM Design and Features

Tri-lobed impellers support quieter airflow with lower downstream pulsation

WHISPAIR™ discharge design helps minimize operating noise levels

Integral shaft ductile iron impellers improve efficiency and airflow stability

Cast iron headplates and rigid one-piece cylinders provide structural durability

Alloy steel timing gears are carburized and ground for dependable synchronization

Cylindrical roller bearings help manage side loads in demanding applications

Piston ring seals reduce internal air leakage during operation

Hydrodynamic oil seals help prevent lubricant contamination inside the air chamber

Splash oil lubrication protects components at both ends of the blower

Detachable mounting feet allow flexible vertical or horizontal installation options

Warranty Information

Models 409 through 621 include warranty coverage for 24 months from startup or 30 months from shipment date, whichever occurs first.

Models 722 through 832 include warranty coverage for 12 months from startup or 18 months from shipment date, whichever occurs first.