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This page contains answers to common questions handled by our support staff, along with information that we have found useful and presented here as questions.


How often does my equipment need certification?

Annual performance testing and certification of air quality is required of all rooms and equipment per national and international standards.  Biannual testing and certification is required for all biological applications (such as healthcare, animal research, and food manufacturing facilities).  More frequent testing and certification may be required depending on specific applications and industries.

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Why is certification necessary?

Performance testing and particle counts are done to objectively determine the air characteristics of a room (such as a clean or isolation room) or the correct operation of air exhaust and filtration systems (equipment ranging from a simple exhaust fume hood to a Class B biological safety cabinet or isolator).  Positive results of this testing classifies a room or piece of equipment into specific NSF and ISO classifications.  Negative results indicate the need for repair or filter replacement to attain positive results.  Once it has been determined that the room or equipment meets or exceeds the manufacturer's specifications as well as national (NSF) and international (ISO) standards, it is certified as complying with a specific standard.  These certifications are then used by accrediting bodies such as the FDA and JCAHCO to assure compliance with air quality standards with their respective accreditations.

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How often are filter changes required?

The frequency of filter changes is dependent on the volume of airborne particulates that the filter is exposed to during a specific period of time.  This exposure can vary with time depending on the environment (such as temperature and humidity levels), the frequency of operation of the room or equipment, and the specific use of the room or equipment.  Performance testing and particle counts on a regularly scheduled basis can approximate the life of the filter based on comparisons between current and previous results.

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Why do I have to recertify after a repair or change in my equipment?

Certifications are immediately revoked with a change to the room or equipment.  Performance testing and particle counts are done statically when the room and/or equipment is functioning, but not in use.  Opening a hood or cabinet for any reason can change the seals and alter performance.  Replacement of filters, motors, capacitors, defective switches, etc. will always change the equipment dynamics.  The simple rearrangement of equipment within a clean or isolation room will alter the air flow and can negatively affect performance testing and particle counts.  All changes therefore require new performance testing and particle counts to assure continued compliance with standards.

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What is an unscheduled or out-of-route trip?

All of our technicians test and certify equipment and rooms using a scheduled route to specific areas of our service area to minimize fuel consumption, additional expenses, and travel time.  The route method allows us to keep our prices consistently the lowest in the industry.  An unscheduled or out-of-route trip is when the technician must go to an area outside of their scheduled normal route for that time.  This could be for an initial certification when the client does not wish to wait for the time when their area is scheduled next, or if they require emergency repairs or filter replacements outside of their next scheduled visit.  We go to specific regions in our service area twice per year as a normal route as most clients require biannual testing.

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How do I request service/certification?

Please call us toll-free at (888) 716-9529, fax us a request for proposal (RFP) to (678) 648-5284, or send us an e-mail at service@dixie-certification.com.

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