What does a pressure barrier separate in building safety concepts?

What does a pressure barrier separate in building safety concepts?

• A. Indoor air from outdoor air
• B. Outdoor air from indoor air
• C. Water vapor from air
• D. Heat from cold air

Answer: (A)

A pressure barrier defines the boundary where indoor and outdoor air meet under a controlled pressure difference. By maintaining a higher or lower pressure inside relative to the outside, the building limits air exchange through openings, helping keep outdoor contaminants, odors, and humidity from infiltrating the indoor space or, in some cases, containing indoor contaminants from escaping. This concept is about directing airflow between the indoors and outdoors to protect indoor air quality and energy performance. It isn’t about separating water vapor or heat; those are addressed by humidity control and thermal management, respectively.

A pressure barrier defines the boundary where indoor and outdoor air meet under a controlled pressure difference. By maintaining a higher or lower pressure inside relative to the outside, the building limits air exchange through openings, helping keep outdoor contaminants, odors, and humidity from infiltrating the indoor space or, in some cases, containing indoor contaminants from escaping. This concept is about directing airflow between the indoors and outdoors to protect indoor air quality and energy performance. It isn’t about separating water vapor or heat; those are addressed by humidity control and thermal management, respectively.