Basic Documentation

Chapter 7–Room Ventilation, Makeup
Air, and Pressurization Control
Systems
Chapter 7 discusses room ventilation, makeup air, and pressurization control
systems in terms of room system configuration, environmental modeling, and
pressurization. It includes the following topics:
• Laboratory ventilation - room system configuration
• Room environmental modeling
• Laboratory room pressurization
Laboratory Ventilation - Room System
Configuration
Whether the ventilation system is constant air volume (CAV) or variable air volume
(VAV) system, the primary purpose of a laboratory room ventilation system is to
maintain a safe environment for the occupants. In addition, the ventilation system
must maintain any required ambient conditions that are necessary for the activities
taking place in the room. Finally, a comfortable environment must be maintained for
the room occupants.
For design purposes, the laboratory room ventilation system should be viewed in
terms of the room supply and room exhaust provisions. A laboratory room’s exhaust
is often an aggregate of various exhaust provisions. For instance, a chemical
laboratory room likely has one or more fume hoods with each connected to a facility
common exhaust system or individually exhausted. Biological laboratory rooms
typically have biological safety cabinets that may be connected to the common facility
exhaust system. These and other kinds of laboratory rooms usually have additional
specialty exhaust provisions such as bench-top snorkels and canopy hoods. Finally,
a laboratory room ventilation system may incorporate one or more room general
exhaust provisions at the ceiling or floor to remove gasses or fumes that may be
present within the room itself.
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