Question

Where openings below grade provide the required natural ventilation for an open parking garage, the outside horizontal clear space shall be ____ times the depth of the opening.

Answer 1

The outside horizontal clear space should be 15 times the depth of the opening in openings below grade for natural ventilation in an open parking garage.

Step-by-step explanation:

According to newer work, the outside horizontal clear space in openings below grade should be 15 times the depth of the opening. This means that if the opening is 1 meter deep, the outside horizontal clear space should be 15 meters.

Previously, an older rule of thumb suggested a ratio of 5 side-to-side and 7-8 deep. However, newer research indicates that a larger outside clear space is necessary for proper natural ventilation.