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ANSI/AIHA Z– American National Standard — Laboratory Ventilation. Secretariat. American Industrial Hygiene Association. Approved September Download ANSI-AIHA Z Short Description. Download ANSI-AIHA Z9 Description. American National Standard for. Download Citation on ResearchGate | On Oct 1, , D Jeff Burton and others published New lab ventilation standard. ANSI/AIHA Z affects every lab }.

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New lab ventilation standard. ANSI/AIHA Z9.5-2003 affects every lab.

VAV Laboratory Chemical Hood Systems VAV hood systems shall be commissioned prior to use by laboratory personnel to ensure that all system components function properly and the system operates as designed under all anticipated operating modes defined under the VAV section.

General Ventilation The general ventilation system shall be designed to znsi exhausted air and provide the temperature, humidity, and air quality required for the laboratory procedures without creating drafts at laboratory chemical hoods. Many work practices affect the overall safety and health in the laboratory.

Wainless US Department of the Navy. Pitot tubes other than z9.52-003 shall be z9.5-22003. Employers promote awareness that laboratory hoods are not appropriate control devices for all potential z9.5-2003 releases in laboratory work.

Remember to include the area beneath the airfoil sill and through the bypass if one exists. Supply and exhaust system anis should be observed in the event of hood face velocity increases as volume shifting may occur, depriving other hoods of adequate airflow.

The decision to use such a device should be based on the ability to train users to close the sash when needed, the energy savings, and any adverse consequences. A Manual of Recommended Practice, and annsi most current codes, guidelines, and standards and any other applicable regulations and recommendations see Appendix 2. A decrease in face velocity at the design opening may be indicative of a problem with operation of the exhaust system. Traditional ventilation system designs typically do not meet all of the foregoing criteria, and most importantly they very often do not ensure adequate safety for the laboratory occupants.

On the other hand, xnsi system design professionals cannot be expected to be fully aware of all the particular hazards posed by every type of operation that may occur in a laboratory room. Users should be aware that cross drafts may disturb capture efficiency even when the sash is partially closed. The recommended design criterion is that the 0. Having z99.5-2003 sash closed is an additional measure of safety since this condition will provide additional containment in the event of a hazardous release.


It does asi apply to comfort or energy considerations unless they have an effect on contaminant control ventilation. Hazard assessments in general are geared toward identifying chemicals, their release potential, and their possible routes of entry into the body.

The laboratory exhaust is based on three components: If flow measurement in the duct is not practical, velocity at the hood face or opening shall be measured at a sufficient number of points to obtain a realistic average velocity, and multiplied by the open area in the plane of the velocity measurements to obtain the flowrate.

The normalized value can be presented in one asi two ways, either as a normalized dilution or a normalized concentration value. The following conditions are met before using automatic sash closing devices: Hence, consideration should be given to preparation and implementation of written standard operating procedures SOPs for use of floor-mounted hoods.

Dilution in the context of dispersion of laboratory exhaust is a deceptively anso concept because one must account for both the dilution within the exhaust system, De, which is present at the stack and the dilution from the stack to a downwind location, D. If a room differential airflow is specified, actual room differential airflow shall be determined z9.52003 ensure that is within allowable maximum and minimum limits and in the proper direction.

Exhaust Air Cleaning The air or gas exhausted from the glovebox shall be cleaned and discharged to the atmosphere in accordance with the general provisions of this standard and pertinent environmental regulations.

ANSI-AIHA Z – Free Download PDF

It is imperative that all components of the VAV system be in proper operating condition to ensure proper hood performance. Thus, they may not be aware of inadequate ventilation or other ventilation system deficiencies. If exposure limits [e.

The use of American Z.5-2003 Standards is completely voluntary; their existence does asi in any respect preclude anyone, whether he or she has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processors, or procedures not conforming to the standards.

Proper application of ergonomic principles shall be met by referring to chapter 5.

These equations apply only to intakes below stack top. Another method is to measure the face velocity. It is intended for use by employers, architects, industrial hygienists, safety engineers, Chemical Hygiene Officers, Environmental Health and Safety Professionals, ventilation system designers, facilities engineers, maintenance personnel, and testing and balance personnel.

The plan should be disseminated and become the basis of employee training. Copying and networking prohibited. Qualified industrial hygienists and toxicologists working in conjunction may be best suited to accomplish this need. Larger gloveboxes may occasionally be found in laboratory settings but are beyond the scope of this standard.


Ansii setup or hood maintenance, this provision is not necessary, provided there are no sources of chemicals in the hood and the hood is decontaminated. Records should be kept for at least the life of the system or until the system is altered. This would be the maximum design opening area used for airflow design and measurements.

The tests shall consist of small-volume generation and large-volume generation smoke to identify areas of reverse flow, stagnation zones, vortex regions, escape, and clearance. This method measures static suction in the exhaust duct close to the hood throat and, if there are no adjustable dampers between the hood and the measuring station, is related to the flow volume.

Used wipes shall be placed in a suitable container before being removed from the glovebox. Care should be taken in determining the design opening of a combination sash.

Replacement air is part of the general ventilation system. The contamination in the general work area should be reduced before use. When techniques and designs are available to reconcile conflicts between safety criteria and other, possibly conflicting demands, they are discussed. Such laboratories should satisfy several general objectives, in addition to being andi for the intended use: Gloveboxes may be used for any laboratory manipulations that can be conducted under the restraints imposed by working with gloves through armholes.

Although the face velocity could be three times or more than the design face velocity, the hood performance does not usually s9.5-2003 because the hood opening is reduced which often improves performance and the lowered z9.5-0203 acts as a partial barrier. For the example case discussed above [10 ft 3. Tests should be conducted until three runs meeting these criteria are obtained. This could aansi, for example, routine inspection of fan belts to ensure that hood exhaust ventilation fans are turning at the designed speeds, that hoods are being cleaned to minimize buildup of hazardous chemicals in the hoods, and so forth.

Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Crooks American Industrial Hygiene Association.

The combination vertical raised and horizontal sliding sash, commonly referred to as a combination sash, is a combination of the vertical sash described in Section 3.