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Ventilation Systems: General vs. LEV.

Ventilation Systems: General vs. LEV.

ANSWER

The passage provides an overview of two different ventilation systems used in workplace settings: general ventilation and local exhaust ventilation (LEV). Here are the key points made in the description:

General Ventilation:

  1. Function: General ventilation systems supply clean air that mixes with the existing air in the workplace, diluting the concentration of contaminants present in the air.
  2. Limitations: General ventilation systems are not suitable for controlling exposure to toxic substances because they actually spread the contaminants throughout the workplace before exhausting them.
  3. Air Requirement: These systems require large amounts of air.
  4. Cost Consideration: Operating general ventilation systems during the winter may be costly due to the need for additional heating.

Local Exhaust Ventilation (LEV):

  1. Function: LEV systems are designed to remove contaminants at the source before they can spread through the workplace.
  2. Efficiency: They take advantage of the natural motion of contaminants to capture them, reducing the need to draw in large amounts of air.
  3. Use for Toxic Materials: LEV systems are particularly useful when dealing with toxic materials, especially when airborne concentrations could exceed OSHA (Occupational Safety and Health Administration) standards.
  4. Requirements for Employers: When using LEV systems to control exposure, employers must ensure that the system is fit for its intended purpose, used correctly by trained employees, regularly maintained for continued effectiveness, and well-documented to demonstrate its ongoing efficacy.
  5. Importance of Hazard Assessment: It is crucial for employers to have a good understanding of the hazards present in the workplace to ensure that the initial design of the LEV system is capable of achieving adequate control.

In summary, general ventilation systems dilute contaminants but are not suitable for toxic substances, while LEV systems are designed to capture contaminants at the source and are especially effective for toxic materials when properly assessed and maintained. Employers must carefully consider the specific hazards in their workplace when choosing the appropriate ventilation system.

Ventilation System Recommendations.

QUESTION

Description

 

 

General (dilution) ventilation systems supply clean air that mixes with the air in the workplace, diluting the concentration of the contaminant. General ventilation is not suitable to control exposure to toxic substances because these systems actually spread the contaminant throughout the workplace before exhausting it. Also, they require large amounts of air and may be costly to operate during the winter because of additional heating.  This has the most limitations when looking at ventilation systems.

Local exhaust ventilation (LEV) systems remove the contaminant before it spreads through the workplace. The systems are designed to take advantage of the motion of the contaminant to capture it without drawing in large amounts of air as well. They are most useful for controlling toxic materials when their airborne concentrations could exceed OSHA standards.  However, when using LEV to control exposure, the employer must thoroughly assess the hazards to be controlled and be satisfied with the following: the LEV system is fit for purpose; it is being used correctly by trained employees; the system is regularly maintained to remain effective; and records are kept demonstrating the system is both effective and ongoing. Having a good understanding of what hazards need to be controlled is crucial to ensure that the initial design is capable of achieving adequate control.

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