Local Exhaust Ventilation Diagrams » Secondary Hoods for Fugitive Emission Control

diagrams of secondary hoods for fugitive emission control highlighting the various features

Applications Tips:

  • Thoroughly characterize fugitive emissions prior to design
  • Provide Make-up air
  • Avoid the use of man-cooling fans

Design Characteristics:

  • Q = (Natural rising velocity at hood face at 100 FPM) times surface area of hood in square feet
  • V is greater or equal to 4000 FPM transport (horizontal runs)
  • he = 2.2VP