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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The location of laboratory chemical hoods and other hoods or vented openings with respect to open windows, doorways, and personnel traffic flow directly influences the containment ability. When these containment sources are not adequate, the laboratory shall conduct a hazard determination to evaluate the situation.
Furthermore, air changes per hour is not the appropriate concept for designing contaminant control systems. The restricted use notice shall state the requisite precautions concerning the type of materials permitted or prohibited for use in the hood. When a person walks andi a laboratory chemical hood he or she sets up a wake that can aspirate contaminants from the laboratory chemical hood.
A decrease in face velocity at the design opening may be indicative of a problem with operation of the exhaust system. During setup or hood maintenance, this provision is not necessary, provided there are no sources of chemicals in the hood and anei hood is decontaminated. This does not apply if the auxiliary air is designed to be conditioned the same as room air. The recommended design criterion is that the 0.
Management should understand that ventilation equipment is not furniture, but rather it is part of installed capital equipment. Smoke particles are rapidly diluted to the extent where they may not be visible even though significant concentrations may exist in the invisible plume. The complications zz9.5-2003 wash-down features and corrosion resistance of the exhaust fan might be avoided by using an air ejector, with the supplier blower located so it is not exposed anzi perchloric acid.
Where the design sash opening area is less than the maximum sash opening area, the hood is equipped with a mechanical sash stop or alarm to indicate openings in excess of the design opening area. Demonstrably equal or better approaches are acceptable. Numerous sensors can be employed in a typical VAV laboratory chemical hood systems such as sash position sensors and room differential pressure sensors, to name a few.
The adverse consequences of the sash closing when the hood ansk is not present to observe is considered before automatic sash closing devices are installed on a laboratory absi hood.
For most operations, z9.52003 seconds will be an acceptable time to achieve the desired area z9.5-22003 but a Hazard Evaluation should be conducted to determine the acceptable time. These suggested design criteria is somewhat more lenient than the smaller criteria suggested in the ASHRAE Handbook — HVAC Applications, Chapter asi, which recommend that air intake concentrations should be less than 3 ppm due to an evaporating liquid spill in a laboratory chemical hood and exhausted at a rate of 7.
It is imperative that all components of the VAV system be in proper operating condition to ensure proper hood performance. Gloveboxes may be used for any laboratory manipulations that can be conducted under the restraints imposed by ansu with gloves through armholes.
Such testing shall include the sensing element, zero drift, and actuation of signals, alarms, or controls.
Accurate determination of the flow direction and derivation of the horizontal and vertical components of the velocity vector require very sophisticated instrumentation because of the low air speeds involved. Appendix 3 provides more detailed information on stack design. Tests should be conducted until three runs meeting these criteria are obtained. Tissue paper and strings do not qualify as the sole means of warning. If because of environmental challenges, face velocity cannot be accurately measured then air flow measurement can replace face velocity 6.
In the closed vertical position, the horizontal sliding panels can be opened to provide anei to the interior hood chamber. If a room differential airflow is specified, actual room differential airflow shall be determined to ensure that it is within allowable maximum and minimum limits and direction at minimum and maximum room exhaust airflow.
Such work permits shall be designed to suit the circumstances, and shall at least address the following factors: The supply and exhaust systems shall be balanced. Will the chemical z9.-2003 have velocity?
We are a non-profit group that run this website to share documents. Please help us to share our service with your friends. No part of this publication may be reproduced in any form, in an electronic retrieval ans or otherwise, without the prior written permission of the publisher. Qualified industrial hygienists and toxicologists working in conjunction may be best suited to accomplish this need.
When techniques and designs are available to reconcile conflicts between safety criteria and other, possibly conflicting demands, they are discussed. Any modification of the hood exhaust shall not compromise other fundamental concerns.
Laboratory-scale gloveboxes, for which this standard applies, should have a maximum internal chamber volume of 50 ft3 1. It does not apply to comfort or energy considerations unless they have an effect on contaminant control ventilation. The sash track can be designed to minimize this potential by hanging the sash from overhead.
If a combination sash provides horizontally moving panels mounted in a frame that moves vertically, the above requirements in Sections 3. The user shall not modify the interior or exterior components of the hood without the approval of the Chemical Hygiene Officer, Responsible Person, or other appropriate authority in the organization.
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