Skylight, scuttle, or bulkhead ventilation is an example of which type of ventilation?

Skylight, scuttle, or bulkhead ventilation is classified as vertical ventilation because it involves the movement of smoke and heat upwards through openings located above the horizontal plane of the fire. This type of ventilation is particularly effective in allowing hot gases to escape from the structure, which helps to improve conditions for firefighters working below.

Vertical ventilation assists in reducing the temperature and improving visibility in the fire environment, making it safer for crews to suppress the fire and search for victims. The openings created through skylights, scuttles, or bulkheads allow for the natural rise of smoke and heat, facilitating a more effective firefighting operation.

On the other hand, horizontal ventilation involves the removal of smoke and heat through openings at or near the same level as the fire, while mechanical ventilation relies on powered fans or blowers to move air through a space. Inward ventilation would refer to efforts that pull air into a space, which does not apply to the types of ventilation mentioned in the question. Thus, the identification of skylight, scuttle, or bulkhead ventilation as vertical ventilation is based on its function in facilitating the upward movement of smoke and heat.