Exhaust Grilles in Anesthetizing Locations

Some jurisdictions have state health regulations that require smoke-exhaust grilles in the ceiling of an anesthetizing location. Isolation dampers are required to isolate the return duct from the exhaust duct. Either a return/relief fan or a separate exhaust fan could be used to remove smoke.However, preliminary testing of this approach has produced mixed results.

01/01/2001


Some jurisdictions have state health regulations that require smoke-exhaust grilles in the ceiling of an anesthetizing location. Isolation dampers are required to isolate the return duct from the exhaust duct. Either a return/relief fan or a separate exhaust fan could be used to remove smoke.

However, preliminary testing of this approach has produced mixed results. With the low air velocity exiting the laminar-flow air devices, the exhaust-air pattern has been shown in cold smoke tests to short circuit and leave a lower level of smoke-table height and below-within the room. Warm smoke may have a better chance of being drawn out at the ceiling level, but the short-circuit possibility still exists. Smoke generated at the table level from surgical drape fires might be drawn across the staff on its way to the ceiling exhaust or left at the lower level.

This removal concept matches the smoke-management techniques applied to atriums and other spaces, where the smoke is directed upwards and the lower six feet of egress space is maintained clear of smoke. The main difference is that in atriums supply air is introduced at the lower level during smoke-removal scenarios while air is supplied at the ceiling in operating rooms at all times.

Further testing is required to ensure proper and safe smoke removal using the typical ceiling-exhaust technique.





Product of the Year
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
40 Under Forty: Get Recognized
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
MEP Giants Program
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
May 2018
40 Under 40 winners, fire and life safety, performance-based designs, and more
April 2018
VRFs, lighting controls, BIM coordination, and more
March 2018
Sizing water pipes, ASHRAE 90.1, recovering waste heat, and more
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me