PAS Pressure based Air System The Pressure based Air Systems from US Draft Co maintains a constant negative pressure in the mechanical room or ducted supply for combustion air. Designed with EC-Flow Technology™, the PAS takes advantage of US Draft Co. bi-directional pressure transducer and proprietary PID technology to rapidly respond to varying outdoor and room pressures to maintain a neutral pressure in the mechanical room or appliance inlet duct when compared to atmosphere. Utilizing an inline supply fan, a V-series control, pressure transducer and outdoor sensor, the system interlocks with fossil fuel fired heating appliances to maintain the required outlet pressure of the manufacturer.

MPF Inline Supply Fan
MEF Inline 90˚ Inline Supply Fan

Control Options

V150 Constant Pressure Controller
  • - Up to 2 Appliances
  • - Up to 2 Applications
  • - True bi-directional (+/- 1.0" wc)
  • - 4-button LCD screen
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V200 Constant Pressure Controller
  • - Up to 4 Appliances
  • - Up to 2 Applications
  • - True bi-directional (+/- 1.0" wc)
  • - 4-button LCD screen
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V250 Constant Pressure Controller
  • - Up to 6 Appliances
  • - Up to 2 Applications
  • - True bi-directional (+/- 1.0" wc)
  • - 4" Color Touchscreen
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V300 Constant Pressure Controller
  • - Up to 4 Appliances
  • - Up to 3 Applications
  • - True bi-directional (+/- 1.0" wc)
  • - 7" Color Touchscreen
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V350 Constant Pressure Controller
  • - Up to 15 Appliances
  • - Up to 3 Applications
  • - True bi-directional (+/- 1.0" wc)
  • - 7" Color Touchscreen
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AX42 Constant Speed Controller
  • - Up to 4 Appliances
  • - Up to 2 Applications
  • - Fixed speed
  • - On-board potentiometer
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