[3dem] cryo-TEM rooms - air changes per hour?

[Stanislav Vitha]

Hallo, 
We are going to be remodeling our cryo-TEM room to get the humidity under control. Temperature will be maintained mostly by radiant cooling panels and humidity reduced by a dessicant air dryer unit.
We would like to recycle at least some of the dry air.  However, since the microscope room is considered a lab, we are facing the requirement for 6 TO 8 Air Changes per Hour (ACH).
I am concerned that maintaining low humidity (under 30%) will be quite difficult or require a big dryer unit.

All of the cryo-TEM lab design articles mention dry air requirements, some mention dry air recycling but  none of them go into specifics regarding  Air Changes per Hour.
If you know how this is handled in your imaging facility/cryo-TEM room, I would love to hear from you.


Thanks for your input.

Stan Vitha  

Dr. Stanislav Vitha      
Research Scientist, Interim Director
Microscopy and Imaging Center  
Texas A&M University 
College Station, TX 77843-2257
http://microscopy.tamu.edu