Product Description

The ROOTS™ RAM™-DPJ WHISPAIR™ rotary blower has an exclusive discharge jet plenum design which allows cool, pressurized system air to flow into the cylinder. This unique design permits operation at high pressure levels with a single stage unit. The RAM high pressure blower is designed for continuous operation at discharge pressures up to 30 psig. It has no valves, vanes or Teflon rings.

The basic model is designed using integral-shaft ductile iron impellers with an involute profile. The casing and headplates are grey iron, while the drive and cover and gear cover are die cast aluminum. Carburized and ground alloy steel spur timing gears are taper mounted on the shafts, secured with a locknut. Cylindrical roller bearing are splash lubricated at both the gear end and drive end.

Piston rings reduce air leakage through the headplate bores and lip-type oil seals prevent lubricants from entering the air chamber. Mechanical seals are available upon request.

Flow Range: to 545 CFM
Max Δ Pressure: 30 PSI
Maximum RPM: 4000
Minimum RPM: 1750
Max ΔT: 240˚F
Inlet Connection: 4″ FPT
Discharge Connection: 5″ FPT
Jet Port Connection: 4″ FPT
Shaft Dia.: 1.5″
Drive End Lubrication: Oil
Gear End Lubrication: Oil
Required Oil for Horizontal Unit: 55 ounces
Required Oil for Vertical Unit: 27 ounces
Unit Weight: 365 pounds (165.9 kg)
Shipping Container: Skid


BOM Number: 83850020 SKU: N/A Categories: ,


  • Meets Build America Buy America Act requirements
Shipping Weight: 405 lbs
Shipping Dimensions: 32 × 29 × 23 in
Max Flow:

900 CFM

Max Speed:

4000 RPM


Howden Roots

Max Vacuum:

16" Hg