reply-type=response

All,
Thank you for your response.  Please let me clarify my question.

  We are using chemical fume hoods and PPE to protect the users from 
exposures to  hazardous chemicals.  In fact these fume hoods are an integral 
part of our lab ventilation system as they serve as the exhaust from the 
laboratory.   I am concerned about the number of air changes in the room in 
the event of a spill or emergency where hazardous chemicals are accidentally 
released into the laboratory air space.  We have SOP's in place for 
evacuation of lab spaces in case of such an emergency.  Knowing ach is an 
important part of the equation for emergency response.  At 21 ach we are 
getting quite a bit of turbulence in the air in the lab and I was wondering 
if reducing the ach would help and still be acceptable from a safety 
standpoint.

Respectfully yours,

Loretta Mueller
Vaccinex Inc



----- Original Message ----- 
From: "List Moderator" 
To: 
Sent: Friday, March 31, 2006 4:52 PM
Subject: [DCHAS-L] Lab Ventilation with multiple hazards

> From:   lmueller**At_Symbol_Here**vaccinex.com
> Date: March 31, 2006 3:44:45 PM EST
>
> I am looking for some guidelines regarding air changes required in 
> laboratories where hazardous chemicals as well as recombinant DNA and 
> bacteria are used on a laboratory/research scale.  We currently have  21 
> air changes / hr, is it ok to scale back to 10?
>
> Thank you,
> Loretta Mueller
> Vaccinex Inc
> 

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