Negative pressure clean room???

[chris kennedy]

Not a code issue but something that doesn't make sense to me. I have guys going to wire an exhaust fan in an existing clean room at a lab today. Why create negative pressure in this environment? Anybody come across this before?

Thanks

 

[cda]

Been so long since I delt with a chip maker, but

http://www.cleanairtechnology.com/negative.php

http://www.cleanairtechnology.com/positive.php

 

[chris kennedy]

Thanks for the links, forwarded the second to GC.

My guys pulled off, this is going to engineering.

 

[chris kennedy]

FWIW, this room is used for finishing eyeglass lenses.

 

[Paul Sweet]

They may be supplying more air than they are exhausting to maintain positive pressure. If not - pre-scratched lenses!