ANSI Z9.5-2003 PDF

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.

The device shall be calibrated at least anssi and whenever damaged. The practical limits of knowing how each ventilation control is being used in the laboratory are considered when specifying design features and performance criteria. Any hazardous materials and any other debris shall be cleaned up before operations resume. On the other hand, if the user does not close the sash, z95-2003 consumption will znsi and an automatic sash closer may be advantageous. Sash movement should require no more than 5 lbs.

The following conditions shall be met before using automatic sash closing devices: The Laboratory Ventilation Management Plan should describe specific responsibilities for each department involved in the design, installation, operation, and use of ventilation systems Table 1 provides some guidance.

In addition there may be need for general room exhaust not through a hood used for contaminant control. The exterior surfaces of the gloves also shall be wiped clean.

Replacement air is part of the general ventilation system. If the contaminant is liquid, any liquid on surfaces z9.5-2003 be wiped with suitable adsorbent material or sponges until visibly clean and dry.

The practical limits of knowing how each ventilation control is being used in the laboratory shall be considered when specifying design features and performance criteria commissioning and routine monitoring.

The design and task-specific applications of floor mounted walk-in hoods may make it difficult to comply with the work practices of Section 6 of this standard. The face velocity of a combination sash is sometimes determined with the sash closed and the horizontal windows open. Sashes should be constructed of transparent anso material suitable for the intended use. Consensus requires that all views and objections be considered, and that a concerted effort be made toward absi resolution. For example, if manipulations below waist height are necessary, special provisions may be necessary such as armports or small openings strategically located at necessary access points.


Crooks American Industrial Hygiene Association. Periodic dynamic testing should be performed when significant changes have occurred or to evaluate the response of a VAV system. Often the lip can be replaced by a ramp to allow wheeled carts to enter the hood.

All instruments using electrical, electronic, or mechanical components shall be calibrated no longer than 12 months before use or after any possible damage including impacts with no apparent damage since the last calibration.

ANSI-AIHA Z9-5-2003

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. It must be interfaced to the building ventilation system. The responsible person as defined in Section 2. If exposure limits [e. Where the airflow to a system like a submerged scrubber is decreased, additional air may be admitted to the system upstream of the ACD to maintain the rated volume flow at the ACD.

Having the sash closed is an additional measure of safety since this condition will provide additional containment in the event of a hazardous release. Operating Conditions Hoods shall be in operation whenever hazardous volatile materials are being used or stored inside. If the diameter is increased to 3. Laboratory chemical hoods are functioning properly and specific measures are taken to ensure proper and adequate performance. At a minimum, the responsible person should coordinate these activities.

New lab ventilation standard. ANSI/AIHA Z affects every lab.

This could include, 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. During setup or hood maintenance, this provision is not necessary, provided there are no sources of chemicals in the hood and the hood is decontaminated.


It is imperative that all components of the VAV system be in proper operating condition to ensure proper hood performance. It also may be used for routine periodic testing, but it is somewhat expensive and other less rigorous tests may be adequate if conditions have not changed since commissioning tests.

The variation in the exhaust volume can be achieved by changing the speed of the exhaust blower or by operating a damper or other control device in the exhaust duct. Qualified industrial hygienists and toxicologists working in conjunction may be best suited to accomplish this need.

Design Criteria When designing stacks with the numerical method, it is necessary to have a design criterion for selecting a stack design. A normalized dilution value can be obtained by multiplying D by the ratio of the actual volume flow rate and a standardized volume flowrate [i. This rating translates to the worker being exposed to 0.

If an ACD is required, its operating efficiency should be relatively wnsi of airflow. Many liquids and some solids have vapor pressures that might cause hazardous concentrations of vapor. A hazard evaluation shall be employed in such complex cases. General Ventilation The general ventilation system shall be designed to replace exhausted air and provide the temperature, humidity, and air quality required for the laboratory procedures without creating drafts at laboratory chemical hoods.

These equations apply only to intakes below stack top.