Ceiling Space

An air curtain system typically uses less ceiling space (particularly above the surgical zone) to introduce the same volume of air into the operating room as a standard laminar flow diffuser system.

In this example, we compare the air curtain diffuser layout against the laminar system diffuser layout for a 480ft2 operating room receiving 20 air changes per hour.

Air Curtain

Laminar System

Next, we compare the air curtain diffuser layout against the laminar system diffuser layout for a 600ft2 operating room with receiving 20 air changes per hour. To meet ASHRAE 170 requirements, laminar flow diffusers use is increased to ensure coverage of 70% of the ceiling area (as defined by the surgical table) plus 12" offset in each direction. With the air curtain system, additional linear slot diffuser capacity means that ceiling space usage remains minimal.

Air Curtain

Laminar System

Finally, we compare the air curtain diffuser layout against the laminar system diffuser layout for a 600ft2 operating room with an airflow of 25 air changes per hour - note that the air curtain mechanical equipment still remains unchanged. Note on this example: 600 is the minimum size for a orthopedic or cardiac surgical space. 25 ach is also a relatively conservative cfm, considering the latest developments in OR equipment and the associated cooling load this additional equipment creates.

Air Curtain

Laminar System

For more information, please consult the Price Engineer's Handbook.