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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By normalizing D, only the dispersion, which occurs between the exhaust stack and the downwind location, needs to be considered. The responsible person defined in Section 2.

A decrease in face velocity at the design opening may be indicative of a problem with operation of the exhaust system. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. In some cases, while the hood is empty, the sash could be removed for setup procedures.

Utilities Utility valves and switches shall be in conformance with applicable codes.

It might consist of ceasing operation, or requiring removal from the premises of all flammable and highly toxic materials. Face velocity is not a measure of safety. When the sash is raised above the design level, the hood could lose adequate control. 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.

If the contaminant is a powder or dust, all internal surfaces shall be cleaned and wiped until visibly clean. The face velocity at the hood opening should not exceed three times the nominal face velocity with the sash fully open. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard.

Since modifications of the volumetric flow of a VAV hood could upset the balance, the supply and exhaust systems should be designed to accommodate the modification in the exhaust air.

ANSI-AIHA Z9-5-2003

On the other hand, if the airflow through the glovebox scrubber system increases to a point where the collection of the ACD is substantially impacted, then the airflow must either be reduced or the ACD redesigned, modified, or replaced to accommodate the higher flowrate velocity for particulate material.


If the lower panels are opened during operations, the hood loses much of its effectiveness, even if face velocities comply with Section 3. The time constant for exposure concentrations mentioned in this standard is measuring over a minute span of time.

These operations shall be performed inside a hood adequate to attain compliance. The hood should be furnished with distribution ductwork or interior baffles to provide uniform face velocity. The hood sash should not be lowered below design position to increase face velocity during routine tests.

A hazard evaluation shall be employed in such complex cases.

We need your help to maintenance this website. In addition there may be need for general room exhaust not through a hood used for contaminant control. 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. The location of laboratory chemical hoods and other hoods or vented openings with respect to open windows, doorways, and personnel traffic flow directly influences z9.5-203 containment ability.

Design Criteria When designing stacks with the numerical method, it is necessary to have a design criterion for selecting a stack design.

Materials shall be resistant to corrosion by the agents to be used. If the contaminant is gaseous, the atmosphere in the box shall be adequately exchanged to remove the potentially hazardous gas. The laboratory exhaust is based on three components: Air-cleaning equipment shall be sized for the maximum airflow anticipated when hazardous agents are exposed in the glovebox and the glovebox openings are open to the extent permitted under that condition.

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

The plan addresses the laboratory operations and procedures that might generate air contamination in excess of the requirements of Section 2. In addition, the tracer gas test does not simulate a live operator, who may increase potential for escape due to operator size, movements near the hood opening, or improper hood use. Determine that sash position of one hood does not affect flow through another hood.

  IEC 60606 PDF

When a person walks past a laboratory chemical hood he or she sets up a wake that can aspirate contaminants from the laboratory chemical hood. The recommended design criterion is that the 0. 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. 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.

VAV Laboratory Chemical Hood Systems VAV hood systems shall be commissioned prior to use by laboratory personnel to ensure that all system components function properly and the system operates as designed under all anticipated operating modes defined under the VAV section.

The laboratory commissioning tests are used to ensure proper air supply and exhaust for each laboratory or zone. In some laboratory design, the normal sash position is not full open. 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.

Blair American Insurance Services Group. The containment and capture of a laboratory hood shall be considered adequate if, in combination with prudent practice, laboratory worker chemical exposure levels are maintained below applicable in-house exposure limits as recommended in 2.

Such work permits shall be designed to suit the circumstances, and shall at least address the following factors: If an ACD is required, its operating efficiency should be relatively independent of airflow. At the time it approved this standard the Z9 Committee had the following members: If it is taken out of service it shall be posted with a restricted use or out- of-service notice.

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