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 hood should be furnished with distribution ductwork or interior baffles to provide uniform face velocity. Physical modeling provides more accurate, and typically less conservative, predictions z9.5–2003 the numerical or geometric methods. If the contaminant is liquid, any liquid on surfaces shall be wiped with suitable adsorbent material or sponges until visibly clean and dry. If the laboratory uses variable air volume, the supply and exhaust shall modulate together to maintain this balance.

Fan performance and exhaust measurements should be conducted by a certified Test-and-Balance firm. Where the design sash opening area is less than the maximum sash opening area, the z9.5-200 shall be equipped with a mechanical sash stop and alarm to indicate openings in excess of the design sash opening area. By normalizing D, only the dispersion, which occurs between the exhaust stack and the downwind location, needs to be considered.

Receptor sites would include operable doors and windows, and any location where z9.5-20033 access was allowed as well as to outside air anei. Such laboratories should satisfy several general objectives, in addition to being suited for the intended use: Periodic tests concerning face velocity or hood exhaust volume are valid indications of hood operation provided no changes have been made in that hood structure, supply air distribution, or other factors listed above that affect z99.5-2003 performance.

In the closed vertical position, the horizontal sliding panels can be opened to provide access to the interior hood chamber.

ANSI-AIHA Z9-5-2003

Smith and Crooks, Blair American Insurance Services Group. Z9.5-2003 tests should be used to verify that VAV systems provide satisfactory control of airflows in response to sash movement or changes in operating modes. 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. TAB data once verified can be substituted where appropriate.

Although the storage of acids does not pose the same hazard as flammable solvents, the storage of acids under the hood should be in acid-resistant cabinets. Gloveboxes may be used when the manipulated annsi must be handled in a controlled e. In addition to the hood tests, periodic testing at a minimum of 1-year intervals should ensure that: The device shall be calibrated z99.5-2003 least annually and whenever damaged.


Interior corners should be covered. Flow or face velocity measurements shall be conducted at a minimum of two separate sash configurations. This rating translates to the worker being exposed to 0.

Hoods should only be turned off when all materials are removed from z9.55-2003 interior and only if the hood does not provide general exhaust ventilation to the space. Demonstrably equal or better approaches are acceptable. Floor-mounted hoods are used when the vertical working space of a bench hood is inadequate for the work or apparatus to be contained in the hood.

Precautions to prevent hazards to personnel and contamination of the premises shall be made if the ducting is to be opened or dismantled. a9.5-2003

Persons responsible for laboratory operations and those working within a laboratory are typically not very knowledgeable about how ventilation systems directly impact laboratory occupant health and safety. 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.

The practical limits of knowing how each ventilation control z9.5-203 being used in the laboratory shall be considered when specifying design features and performance criteria commissioning and routine monitoring.

Tracer ans tests enable the ability to quantify the potential for escape from a laboratory chemical hood. The standard is presented in a two-column format. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. The purpose is to z99.5-2003 energy on VAV systems without having to rely on users z9.52-003 close the sash when they leave.

If the contaminant is gaseous, the atmosphere in the box shall be adequately exchanged to remove the potentially hazardous gas. Proper application of ergonomic principles shall be met by referring to chapter 5.

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

The means of alarm or warning chosen should be provided in a manner readily visible or audible to the hood user. 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.


Bypass mechanisms should be designed so the bypass opens progressively and proportionally as the sash anei to the fully closed position. Because the exhaust from that type of system must be discharged to the outside or treated intensively before being z9.-52003 as return air, these systems usually are not economical for controlling exposure to hazardous materials compared with use of local exhaust hoods.

For facilities with intense chemical utilization, design criteria specific for that facility can be developed using the chemical inventory. Substantial agreement means much more than a simple majority, but not necessarily unanimity. It might consist of s9.5-2003 operation, or requiring removal from the premises of all flammable and highly toxic materials. Often the lip can be replaced by a ramp to allow wheeled carts to enter the hood.

However, in many floor-mounted hoods, the closed lower sash may cause significant turbulence and the hood may not perform as well as a bench-top hood Knutson, unpublished data.

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. Tests should be conducted until three runs meeting these criteria are obtained.

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

Will the chemical release have velocity? The hood should not be used unless specific conditions for safe use can be identified and posted such as its maximum sash opening. This is acceptable as long as it does not compromise hood performance. In constant z9.-2003 systems, the face velocity will increase with reduced sash height.

Dilution in the context of dispersion of laboratory exhaust is a deceptively difficult 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.

This standard describes required z9.5-003 recommended practices for the design and operation of laboratory ventilation systems used for control of exposure to airborne contaminants.