Air Intakes and Outlets

Ventilation systems - air intakes and outlets and rules of thumbs

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 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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