Ventilation systems - air intakes and outlets - 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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