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: vickroy....@mhsil.com
To: histonet@lists.utsouthwestern.edu
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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