NSF has not placed a control plate above the work surface in almost 20 years. I don't object to leaving that an option but the chances a manufacturer would prefer it are remote. Due to the spacing between the cylinder and the front grill, placing the control plate above that grill will virtually always create an obstruction of normal flow though the grill. The main purpose of this ballot proposal is to allow flexibility with the location of the plate under the work surface, such that you do not obstruct the normal flow of air through the front grill.
Stephen Williams
Senior Specialist, Engineering
Biosafety Cabinetry, Wastewater
T 734-769-5357 E williams@nsf.org
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