Car Park Ventilation – Assisted Natural
Ventilation
Which must provide 2.5% free area openings of net car park
floor area to comply with Approved Document B
Must be split with at least 50% openings on opposing walls.
System must be combined with Induction Fans Only to create
3ACH to comply with Approved Document F.
Example:
Area 1000m
2
Total required openings = 25m
2
Free Area
Minimum elevations with at least 25% each = 6.25m
2
x 2
Aggregate elevations = 50% = 12.5m
2
6.25m
2
Free Area
6.25m
2
Free Area
12.5m
2
Free
Area
Car Park Area = 1000m2
