Absolutely the Face velocity changes with the work area set-up. This is why I
like to make sure the air flow away is maintained at a minimum. Most grossing
stations have large working area and often the flow away from the grosser is
not checked, just the vent opening draw. Most important is to set up a process
and then regularly check.
Sent from Windows Mail
From: E. Wayne Johnson 朱稳森
Sent: Saturday, February 1, 2014 3:12 PM
To: WILLIAM DESALVO
Cc: Vickroy, Jim, histonet
Face velocity is simply the airflow rate in CFM divided by the area of
the hood opening in square feet.
A smaller opening at the same flow rate gives a higher face velocity.
Titanium tetrachloride in a small plastic squeeze bottle can be used to
generate "smoke".
On 3:59 AM, WILLIAM DESALVO wrote:
> We use a company called C-Scan Technologies, Phoenix, AZ. The way they test
> all our gross dissection stations is by testing for directional or smoke
> containment and face velocity. We also check th they external pathway is
> clear and if the unit has a filtering system, the filters are changed
> regularly. The air flow measurement is Feet per minute (FPM) for face
> velocity and includes width, height, depth and total square ft for the
> working area. They exhaust flow in CFM. Face velocity minimum requirement is
> 100 fpm, exhaust flow requirement is>500 cfm. Face velocity fluctuates
> depending on the room and the air exchange rate for the area. I have always
> felt the face velocity is most important to gross dissection personnel. There
> needs to be adequate draw away from the employee, no matter the physical
> conditions of the room.
>
> William DeSalvo, BS HTL(ASCP)
> Production Manager-Anatomic Pathology
> Chair, NSH Quality Management Committee
> Owner/Consultant, Collaborative Advantage Consulting
>
>
>
>> From: [email protected]
>> To: [email protected]
>> Date: Fri, 31 Jan 2014 12:46:08 -0600
>> Subject: [Histonet] Gross lab seniors
>>
>>
>> We have several gross lab senior grossing stations that are vented outside.
>> Our engineering asked today whether the airflow should be checked yearly
>> like other exhaust hoods. Problem is there is not a door like other hoods
>> of course and how would you measure the airflow? Recommended airflow is
>> 500cfm however clearly the airflow at the working surface is not anything
>> close to that. I wondered how anybody else monitors the gross lab seniors
>> or do they at all. CAP used to ask about documentation for checking hoods
>> however I can't recall them ever checking on grossing stations. We change
>> filters annually only since they are vented outside.
>>
>> Jim
>>
>> James Vickroy BS, HT(ASCP)
>>
>> Surgical and Autopsy Pathology Technical Supervisor
>> Memorial Medical Center
>> 217-788-4046
>>
>>
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>
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