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Air Intakes and Outlets

Ventilation systems - air intakes and outlets - rules of thumbs

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ventilation intake outlet

Intakes

  • Intakes should be at least 0.15 m (0.5 ft) above the terrain. In areas with traffic the intake should be at least 5 m (16 ft) above the terrain
  • The distance between intake, firewalls and surrounding buildings must be according the rules of the local authorities
  • Short cutting intake air with used outlet air must be avoided
  • An air intake should be located in a position where the wind influence on the pressure conditions within the system is limited
  • Air velocities in the intake openings should not exceed 2.5 m/s (~ 500 ft/min)

Outlets

  • Outlets should go direct out in unrestricted area
  • Short cuts with intake air, window openings and residence areas must be avoided
  • The distance between outlet, firewalls and surrounding buildings must be according the rules of the local authorities
  • An air outlet should be located in a position where the wind influence on the pressure conditions within the system is limited
  • The air velocity through the outlet should not exceed 3 - 15 m/s (~ 500 - 3000 ft/min)
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