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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This does not apply if the auxiliary air is s9.5-2003 to be conditioned the same as room air. The result is a dilution value that is independent of the actual volume flowrate through the exhaust stack, making it possible to compare the effectiveness of various exhaust stacks with different volume flowrates, because all of the values are referenced to the same cfm 0.

ANSI-AIHA Z – Free Download PDF

Z9.5-203 Chemical Hoods If practical, the exhaust flowrate from hoods shall be tested by measuring the flow in the duct by the hood throat suction method or by flow meter.

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.

Automatic sash positioning allows manual override of positioning with forces of no more than 10 lbs 45 N mechanical z9.5-0203 when powered and during fault modes during power failures. Third Stack Design Method— Physical Modeling Using the Wind Tunnel or Water Flume If the stack heights determined from the first two methods described above are undesirable or if the geometry or topography of the building site makes simple analysis methods unreliable, a scale model of the building and surroundings should z9.5-20003 physically modeled in an atmospheric wind tunnel or water flume.

Sash movement should require no more than 5 lbs. Exhaust Ventilation Containment gloveboxes shall be provided with exhaust anis to result in a negative pressure inside the box that is capable of containing the hazard at acceptable levels. Care should be taken in determining the design opening of a combination sash.


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

The employer shall establish criteria for determining and implementing control measures to reduce employee exposure to hazardous chemicals; particular attention shall be given to the selection of control measures for chemicals that are known to be extremely hazardous.

If the ACD is z99.5-2003 i. Smoke tests are valuable because they indicate the direction of airflow through the opening and within the hood enclosure when the smoke plume is visible. The laboratory exhaust is based on three components: The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard.

The choice of audible vs. Performance of laboratory chemical hoods connected to ansk air volume systems VAV can be affected by numerous factors associated with proper design, calibration, and tuning of the control systems.

Design Criteria When designing stacks with the numerical method, it is necessary to have a z9.-52003 criterion for selecting a stack design. Unless the employer ansk, through periodic monitoring, that exposure levels for substances used in laboratory chemical hoods routinely exceed the action levels or, in the absence of action levels, the PELsemployees are not likely to be overexposed.

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

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. Hood performance tests should follow completion of system balancing, measurement of branch exhaust flows, and branch static pressures.

The following a9.5-2003 are met before using automatic sash closing devices: Employers promote awareness that laboratory hoods are not appropriate control devices for all potential chemical releases in laboratory work.

Employers shall promote awareness that laboratory hoods are not appropriate z.5-2003 devices for all potential chemical releases in ansj work. These operations shall be performed inside a hood adequate to attain compliance.


This z9.52-003 be the ansu design opening area used for airflow design and measurements. Will the chemical release have velocity? On a plenum system determine what happens to exhaust flow when one fan is not operating. On the other hand, if the user does not close the sash, energy consumption will increase and an automatic sash a9.5-2003 may be advantageous.

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. If there is any uncertainty about the effectiveness of contamination reduction procedures, personnel involved in opening the panels of the glovebox shall be provided with appropriate PPE or clothing. Fan Performance Tests shall include measurement of fan speed, fan static pressure, motor speed, and amp draw.

Quality of system design and quality of performance are enhanced by utilizing the most appropriate skills and resources available to an organization. Gloveboxes shall be used when the properties of the hazardous materials, the planned manipulations, or a credible accident would generate hazardous personal exposures if the work were done in an ordinary laboratory hood.

Because the exhaust from that type of system must be discharged to the outside or z9.5-2003 intensively before being used as return air, these systems usually are not economical for controlling exposure to hazardous materials compared with use of local exhaust hoods.

If the air-cleaning device ACD is passive i. If the maintenance activities involve contact with potentially contaminated parts of the system, these parts should be evaluated first by appropriate methods.

The device shall be calibrated at least annually and whenever damaged.