Attachment 1 - Process Specific Ventilation Design ...



Attachment 1

Process Specific Ventilation Design Requirements

|Operation |Recommended Exhaust System | General Guidelines |Reference |

|Spray Painting |Paint Spray Booth |OSHA requires spray painting operations to have a minimum |29CFR 1910.107, Spray Booths: |

| | |average air velocity of 100 fpm over the open face of the |29CFR 1910.94c, |

| | |booth (electrostatic spraying is exempt). OSHA makes other |Chapter 21, “Paint Spray |

| | |requirements for construction materials, interior surface and |Operations” |

| | |floor design, design of baffle plates, cleaning, and the |NFPA 91 |

| | |separation from other operations. |ACGIH Handbook of Industrial |

| | |A visible gauge shall be used to indicate the velocity being |Ventilation (latest edition) |

| | |maintained in the booth. The booth shall also be equipped | |

| | |with an audible alarm to warn users of insufficient velocity | |

| | |rates. | |

| | |NFPA 91, ACGIH, and Chapter 11 of this Manual must be | |

| | |consulted for additional design guidance. | |

|Welding |LEV |OSHA requires 100 feet per minute (fpm) in the zone of welding|29CFR 1910.252 |

| | |for a local exhaust hood. Other requirements exist for fixed |Chapter 14, “Hot Work Management |

| | |enclosure welding and confined space welding. The minimum |and permit System” |

| | |distance that shall be maintained between the welding zone and| |

| | |the face of the hood is 6 inches. Recommended designs are |ACGIH: Industrial Ventilation – A |

| | |described for a movable exhaust hood, bench hood, and |Manual of Recommended Practice |

| | |production level welding in the referenced ACGIH Manual. |(latest edition) |

| | |Welding curtains shall be used to block cross drafts, but | |

| | |should not restrict exhaust ventilation. | |

|Operation |Recommended Exhaust System | General Guidelines |Reference |

|Abrasive Blasting |LEV |Blast cleaning enclosures shall be kept negative pressure |29CFR 1910.94(a) |

| | |to the surrounding areas through the use of exhaust |ACGIH: Industrial Ventilation – A |

| | |ventilation during blasting. The exhausted air must be |Manual of Recommended Practice (latest|

| | |discharged through dust collecting equipment. ACGIH has |edition) |

| | |recommended designs for blasting cabinets and blasting | |

| | |room. | |

|Plating, Cleaning and |LEV |Recommended ventilation rates are dependent on a number of |ACGIH: Industrial Ventilation – A |

|Treatment Tanks | |parameters, which include the hazard potential of the |Manual of Recommended Practice (latest|

| | |material, tank configuration and location, and the type of |edition) |

| | |ventilation system. Consult the referenced ACGIH document | |

| | |for design guidance. | |

|Grinding |LEV |OSHA requires grinding wheels, buffing and polishing |29CFR 1910.94(b) |

| | |wheels, grinding belts and other grinders to have local |29CFR 1910.1000 |

| | |exhaust ventilation when employee exposures exceed |ACGIH: Industrial Ventilation – A |

| | |established limits (29CFR 1910.1000). Exhaust ventilation |Manual of Recommended Practice (latest|

| | |must meet minimum requirements (29CFR 1910.94(b)). |edition) |

| | |Recommended LEV specifications have been developed by the |Chapter 11, “Machinery, Machine |

| | |ACGIH. |Guarding, and Hand and Portable |

| | | |Powered Tools” |

|Wood Working (saw |LEV |Recommended hood systems are described in the referenced |ACGIH: Industrial Ventilation – A |

|cutting/ jointing) | |ACGIH Manual. LEV systems need to be designed with a |Manual of Recommended Practice (latest|

| | |clean-out door to enable the removal of wood dust. Duct |edition) |

| | |velocities should be maintained at a minimum of 3500 fpm to| |

| | |prevent the settling and clogging of the duct. | |

|Operation |Recommended Exhaust | General Guidelines |Reference |

| |System | | |

|Laboratory |LEV (Chemical fume hood,|Where operations can cause excessive employee exposures, LEV |SI Laboratory Safety Manual |

| |glove box, or capture |(chemical fume hood, glove box, capture hood) shall be used. |ANSI/AIHA Z9.5-2003 |

|(animal and biological |hood) |The laboratory hood selected must provide an adequate face |ACGIH: Industrial Ventilation – A |

|operations – see | |velocity to capture and contain hazardous chemicals. Design |Manual of Recommended Practice (latest |

|additional information | |guidelines are provided in the referenced ANSI/AIHA standard |edition) |

|below) | |and ACGIH Manual. Some design elements that must be | |

| | |considered include; construction materials, flow monitoring | |

| | |devices, hood location, sash type, use patterns, utilities | |

| | |needed, ductwork, air cleaning, decontamination, and alarms. | |

| |GMV |OSHA recommends general mechanical ventilation sufficient to |ANSI/AIHA Z9.5-2003 |

| | |ensure that laboratory air is continually replaced, and that |29CFR 1910.1450 |

| | |airflow is directed into the laboratory from non-laboratory | |

| | |areas. | |

|Laboratory - |LEV (Biological safety |The selection of appropriate engineering controls is |CDC. Biosafety in Microbiological and |

|Biological/ Animal |cabinets, enclosures) |dependent on a risk assessment of the agents and activities |Biomedical Laboratories |

| |GMV |used in the laboratory. Facilities must be designed with |CDC/NIH. Primary Containment for |

| | |containment in consideration. Specifications for the design |Biohazards |

| | |and installation of biological safety cabinets can be found |ANSI/AIHA Z9.5-2003. |

| | |in the referenced documents. |ACGIH: Industrial Ventilation – A |

| | | |Manual of Recommended Practice (latest |

| | | |edition) |

|Operation |Recommended Exhaust System|General Guidelines |Reference |

|Flammable/ Combustible|GMV |OSHA has established ventilation requirements to prevent |29CFR 1910.106 |

|Chemical Storage | |fire and explosions, 29CFR 1910.106. For inside storage |29CFR 1910.1000 |

| | |areas, room exhaust ventilation must be sufficient to |ACGIH Handbook of Industrial |

| | |provide six air changes per hour, under negative pressure, |Ventilation (latest edition) |

| | |by a mechanical or gravity exhaust system. If employee | |

| | |health is an issue, additional exhaust ventilation must be | |

| | |used. | |

|Photo Processing |LEV/ GMV |For open tray processing, a local exhaust ventilation |Kodak J-314 |

| | |system shall be operated to provide 75 fpm air velocity | |

| | |above the furthermost edge of the trays. When local | |

| | |exhaust ventilation is absent, general (dilution) | |

| | |ventilation shall be maintained at a minimum of 10 air | |

| | |changes per hour, under negative room pressure, and shall | |

| | |be sufficient to reduce air contaminants to an acceptable | |

| | |user level. A supply and return system must exist in each | |

| | |area that is partitioned off as a separate room. | |

| | |For automated processing, local exhaust ventilation shall | |

| | |be provided in accordance with the manufacturer’s | |

| | |recommendations. General (dilution) ventilation shall be | |

| | |maintained at a minimum of four air changes per hour, | |

| | |negative room pressure. | |

|Photocopying Equipment|GMV |Dilution ventilation must be sufficient to minimize air |ASHRAE 62.1-2004 |

| | |contaminants including ammonia and ozone from photocopiers | |

| | |and other duplicating machines. These machines shall not | |

| | |be placed in closets or in other enclosed areas without an | |

| | |HVAC supply and return. | |

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