Exhaust ventilation system

Although metallic antimony may be handled freely without danger, it is recommended that direct skin contact with antimony and its alloys be avoided. Properly designed exhaust ventilation systems and/or approved respirators are required for operations that create dusts or fumes. As with other heavy metals, orderly housekeeping practice and good personal hygiene are necessary to prevent ingestion of (or exposure to) antimony. 

Recordkeeping and analytical program for use in monitoring and maintenance of exhaust ventilation systems. Requires Apple II. 

When the gate is totally protected, there are no other openings in the building envelope and there is a balance between supply and exhaust ventilation systems, (Fig. 7.104). In this case the pressure difference across... 

Certainly, some workplace operations involving highly toxic and/or valuable materials can be controlled more effectively by LVHV ventilation than by conventional local exhaust ventilation. These situations represent opportunities to improve worker protection, recover valuable materials, and to reduce replacement air requirements. Designers of local exhaust ventilation systems should be mindful of such opportunities and take advantage of LVHV control methods. 

Engineered control The removal or reduction of a hazard through implementation of an engineered solution, such as material substitution, process change, or installation of an exhaust ventilation system. 

Ventilation of the building should provide a reasonable ventilation rate and the negative pressure indoors should be minimized. A balanced ventilation system with supply and exhaust ventilation is to be preferred to a mechanical exhaust ventilation system. 

Chemical Systems Laboratory Standing Operating Procedure (CSL SOP) 70-18, 10 Nov 82, Exhaust Ventilating Systems. 

Start-up of the exhaust ventilation system and critical equipment must be sequenced to prevent a hazardous condition. In addition, the starting of the supply air handling unit and the exhaust fan services each room shall initiate simultaneously to avoid placing the room under positive pressure. Automatic transfer switching will be used. 

Position uphill and upwind stay away from building exhaust/ventilation systems. 

Local exhaust ventilation systems LEV required at all dust- or vapor-generating operations and exhausted to the outside through HEPA filters. Full enclosure (containment) ventilation systems recommended... 

The idea of using airflows to collect a substance similar to explosive vapors and/or particles is not unique. From an engineering systems design perspective, collecting an explosive from a person can be directly compared to local exhaust ventilation systems used in industry for contamination control, e.g., welding hoods, open vapor tanks,... 

The levels also permitted assessment of the laboratory hoods and exhaust ventilation system for effective removal of air contaminants. 

Ventilation is the standard method of controlling exposure to airborne vapors of epoxy resins and solvents. Ventilation involves controlling air flow to reduce exposure. Local exhaust ventilation systems capture the vapor at the source and either filter or remove it from the work area. The ventilation system needs to be designed so that vapors, aerosol, and dusts are pulled away from, and not into, the breathing zone of the workers. A constant supply of fresh, noncontaminated air should be available at all times. 

Examples of local exhaust ventilation system are drawdown exhaust tables, slot hoods, dust extraction systems, and portable vapor and dust collectors. Care must be taken that the ventilation systems are utilized and maintained as designed. The condition of the filters and air flow rate should be checked periodically as well as the condition of the duct work, motors, belts, etc. 

The design or selection of effective exhaust ventilation systems in work areas mnst inclnde ... 

Discuss transport air velocities in exhaust ventilation systems. 

When designing a local exhaust ventilation system for a process that generates dust particles, it is important to consider the minimum air velocity. The minimum air velocity is the velocity required to prevent settling of dust particles in the air ducts. The minimum velocity is a function of dust particle size and particle density. Listed in the table below are the minimum air velocities recommended for the transport of various types of particulate contaminants. 

Local Exhaust Ventilation. Local exhaust ventilation is designed to intercept the flammable atmosphere at the source of release and directs it into a system where air is safely separated from the fuel. Correctly designed local exhaust ventilation systems could be very effective in limiting the spread of dust cloud atmospheres beyond the source of release. Local exhaust ventilation is generally less expensive to run than dilution ventilation because less air is used. 

A local exhaust ventilation system generally includes hood, ductwork, filter, and fan. 

One in series on improved local exhaust ventilation systems providing dramatic reductions in emissions. 

Of the various scenarios evaluated, the most serious consequences resulted from the spill of volatile process materials or a fire in an SCB. Based on these evaluations, structures, systems and components with the potential to mitigate this hazard were identified. While many features in the HCF control or mitigate the hazards for both workers and the public, the most significant mitigative feature for the protection of the public is the filtered HCF exhaust ventilation system. 

To limit considerably the release of fission products beyond the containment, a permanent under-pressure is maintained in the inter-containment gap of the V-392 design. This safety function, one of the most important, is fulfilled by two systems (1) an exhaust ventilation system equipped with a filtering plant with suction from the inter-containment gap and outlet... 

Clean tempered outdoor air supplied to a workspace to replace the air removed by an exhaust ventilation system or by an industrial process that has removed air from the environment. 

ANSI Z9.2, Fundamentals Governing the Design and Operation of Local Exhaust Ventilation Systems ANSI Z16, Accident Statistics (NSC)... 

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