Product Description

Flow Range: to 900 CFM
Max Δ Pressure: 18 psi
Max Δ Vacuum: 16″ Hg
Maximum RPM: 4000
Minimum RPM: 850
Max ΔT: 240˚F
Connection: 5″ 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: 350 pounds (159.1 kg)
Shipping Container: Skid

Seal Elastomers
RAM-GJ units are equipped standard with Viton™ O-rings, but for steam applications or special chemical processing two elastomer upgrades are available for special order:

  • Viton™ – Type A Viton O-rings (Durometer 75) are standard on RAM-GJ units. Viton™ fluoroelastomer performs at a wide range of temperatures, with oil and chemical resistance being unaffected by elevated temperatures. It also provides resistance to degradation by a wide variety of fluids and chemicals, including excellent resistance to oils, fuels, lubricants, and most mineral acids.
  • Aflas® – Aflas O-rings are suited for steam applications. TFE/P is a copolymer of tetrafluoroethylene and propylene with a fluorine content of approximately 54%. A unique material due to its resistance to petroleum products, steam, and phosphate-esters, TFE/P is ideal for heat transfer media, amines, acids and bases, as well as hot water and steam up to +170°C (+340°F). Service temperatures are (25°F) to +204°C (+400°F); The compression set resistance at high temperatures is inferior to standard fluorocarbons.
  • Kalrez® – DuPont™ Kalrez® perfluoroelastomer (FFKM/FFPM) parts resist over 1,800 different chemicals, while offering the high temperature stability of PTFE (327°C). They’re used in highly aggressive chemical processing, semiconductor wafer fabrication, pharmaceutical, oil and gas recovery, and aerospace applications.

Special Coatings
In addition to upgrading the seal elastomer, additional steps can be taken to protect your unit in demanding applications. pdblowers can coat the wetted components of your blower with Electrolysis Nickel, Armoloy® TDC, Gullon, or Gullite depending on your specific need. Contact us to speak with one of our professional application engineers.

409 RAM Whispair Gas Blower

BOM Number: 82425020, 82412020 SKU: N/A Category:


  • Meets Build America Buy America Act requirements
Shipping Weight: 375 lbs
Shipping Dimensions: 42 × 29 × 23 in
Max Flow:

900 CFM

Max Pressure:

18 psi

Max Vacuum:

16" Hg

Max Speed:

4000 RPM




Seal Elastomer

RAM-GJ units come equipped with Viton™ seals, however other options are available for special applications. See product description for more detail about these options. A special seal will add 12-14 weeks lead time to your order.