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 sash position at which benchmark face velocity is measured shall be recorded with the face velocity measurement and reproduced each time measurements are taken. If a specified room dP has been specified, the dP shall be measured to ensure that it is being controlled within its allowable range with all doors closed and at minimum and maximum room exhaust airflow.
As a starting place, it is suggested here to have the stack provide protection similar to what a laboratory chemical hood would provide a worker standing at the hood. Values for control level may not be suitable for establishing hood safety, as the tracer gas test methods may not adequately simulate actual material use, risk, or generation characteristics.
Scholz American Glovebox Society. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.
ANSI-AIHA Z – Free Download PDF
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. This rating translates to the worker being exposed to 0. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval.
At a minimum, the responsible person should coordinate these activities. Having the sash closed is an additional measure of safety since this condition will provide additional containment z99.5-2003 the event of a hazardous release. Proper application of ergonomic principles shall be met by referring to chapter 5.
The first step in the assessment is to identify what chemical s can be released including normally uncharacterized byproducts.
The contamination in the general work area should be reduced before use. This standard does not apply to such rooms. Compliance with the Standard should only be claimed when all applicable provisions or elements z9.5-2003 the Standard are met. However, the larger 30, cfm The vertical raised sash provides for full-face opening in the open position.
Laboratory Chemical Hoods If practical, the exhaust flowrate from hoods shall be tested by measuring the flow in the duct by the hood throat suction z9.52003 or by flow meter. Most laboratory experts agree that velocities above fpm 0. The balance can be achieved by maintaining a differential pressure between the room and a reference point, for example the corridor, typically accomplished by maintaining a fixed difference offset between the supply and exhaust volumes.
Remember to include the area beneath the airfoil sill and z95.-2003 the bypass if one exists. Z9.5-203 marking the work surface with a tape or other means, to andi the 6 in. When standard provisions are in conflict, the z95.-2003 stringent applies.
Face velocity has been used as the primary indicator of laboratory hood performance for several decades. The means of alarm or warning chosen should be provided in a manner readily visible or audible to the hood user. Please copy and paste this embed script to where you want to embed Embed Script. This includes local monitoring provisions for such items as hood airflow or room differential pressure as well as remote and central monitoring provisions for such parameters.
The responsible person as defined in Section 2. Automatic sash positioning allows manual override of positioning with forces of no more than 10 lbs 45 N mechanical both when powered ansl during fault modes during power failures.
Supply and exhaust system capacities should be observed in the event of hood face velocity increases as volume shifting may occur, depriving other hoods z9.5-203 adequate airflow. Periodic dynamic testing should be performed when significant changes have occurred or to evaluate the response of a VAV system. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests.
If the contaminant is a powder or dust, all internal surfaces shall be cleaned and wiped until visibly clean. 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.
Escape more than the control levels stated above shall be acceptable at the discretion of the design professional in agreement with the responsible person 2. Pumphrey Chicago Transit Authority. If the diameter is increased to 3. The overall goal of providing a safe workspace for the end users can be greatly enhanced by the use of a hazard assessment and system design team.
Sashes should be constructed of transparent shatterproof material suitable for the intended use. Larger gloveboxes may occasionally be found in laboratory settings but are beyond the scope of this standard. Pitot tubes other than standard shall be calibrated. If the maintenance activities involve contact with potentially contaminated parts of the system, these parts should be evaluated first by appropriate methods. The face velocity at the hood opening should not exceed three times the nominal face velocity with the sash fully open.
Reverse flow in this region is particularly worrisome as the wake zone that anzi in front of a hood user could overlap with the reverse flow zone. Ajsi, a procedure should be established to notify hood users before any maintenance is to be performed so work in the hood can be halted during maintenance. A decrease in face velocity at the design opening may be indicative of a problem with operation of the exhaust system.
Laboratory chemical hoods are functioning properly and specific measures are taken to ensure proper and adequate performance. The time constant for exposure concentrations mentioned in this standard is measuring over a minute span of time. At first glance, the smaller flowrate stack that yields the larger dilution would seem to be preferred. Qualified industrial hygienists and toxicologists working in conjunction may be best suited to x9.5-2003 this need. The hood should be furnished with distribution ductwork or interior baffles to provide uniform face velocity.
Other chemicals, less widely known and used, may have similar properties. In addition there may be need for general room exhaust not through a hood used for contaminant control. In some laboratory design, the normal sash position is not full open.