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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Flow or face velocity measurements shall be conducted at a minimum of two separate sash configurations.
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. If a room differential airflow is specified, actual room differential airflow shall be determined to ensure that is within allowable maximum and minimum limits and in the proper direction.
The responsible person as defined in Section 2.
ANSI-AIHA Z – Free Download PDF
Another method is to measure the face velocity. Although the face velocity could be three times or more than the design face velocity, the hood performance does not usually deteriorate because the hood opening is reduced which often improves performance and the lowered sash acts as a partial barrier. Persons responsible for laboratory operations and those working anzi a absi are typically not very knowledgeable about how ventilation systems directly impact laboratory occupant health and safety.
When control of utilities from inside the glovebox is required, additional valves and switches shall be provided outside the glovebox for emergency shutoff. If the room has more than one ventilation control mode i. Hoods should only be turned off when all materials are removed from the interior and only if the hood does not provide general exhaust ventilation to the space.
Type of sashes available are as follows: Tracer gas tests enable the ability to quantify the potential for escape from a laboratory chemical hood. Printed in the United States of America. z9.55-2003
At a minimum, commissioning tests should test a representative sample of sensors to verify accurate reporting of information. The face velocity of a combination sash is sometimes determined with the sash closed and the horizontal windows open.
Precautions to prevent hazards to personnel and contamination of the premises shall be made if the ducting is to be opened or dismantled. U-tube manometers shall not be used for pressures less than 0.
Note that additional commissioning requirements will be necessary for these systems see Section 6. The following conditions shall be met before using automatic sash closing devices: Having the sash closed is an additional measure of safety since this condition will z9.5-200 additional containment in the event of a hazardous release.
New lab ventilation standard. ANSI/AIHA Z affects every lab.
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.
We need your help! The accuracy of a scale used for a given parameter shall meet the following requirements: 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.
If additional utilities are required, other than electrical, they may be located inside the hood provided they have outside cutoffs and can be connected and operated without potentially subjecting the hood operator to exposure from materials in the hood or other unsafe conditions. Proper application of ergonomic principles shall be met by referring to chapter 5. When the sash is raised above the design anis, the hood could lose adequate control.
At first glance, the smaller flowrate stack that yields the larger dilution would seem to be preferred. TAB data wnsi verified can be substituted where appropriate. Provision shall be made for maintenance of the ACD without hazard to personnel or the environment and so as not to contaminate the surrounding areas. The following conditions are met before using automatic sash closing devices: 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 ansl the supply and exhaust volumes.
Hood containment should be evaluated at different mannequin heights to represent workers of different height. Furthermore, the specific work and operations of some laboratory facilities may need to be kept more confidential and may even be highly secretive. Sash-limiting devices stops are not removed if the design opening is less than full opening. By normalizing D, only the dispersion, which occurs between the exhaust stack and the downwind location, needs to be considered.
Much of this standard addresses a generic approach to exposure control. The variation in the znsi 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. 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.
Z9.5-203 American National Standard may be revised or withdrawn at any time. Hood face velocity is usually defined as air speed in a direction normal to the plane of the hood face opening.
Records should be kept for at least 1 year or until the next required test is performed.
New lab ventilation standard. ANSI/AIHA Z9.5-2003 affects every lab.
The adverse consequences of the sash closing when the hood operator is not present to observe is considered before automatic sash closing devices are installed anai a laboratory chemical hood. Laboratory worker chemical exposures are maintained below applicable in-house exposure limits. Physical modeling provides more accurate, and typically less conservative, predictions than the numerical or geometric methods.