Local Exhaust Devices

Local exhaust ventilation systems can be the most cost-effective method of controlling air pollutants and excessive heat. For many manual operations, capturing pollutants at or near their source is the only way to ensure compliance with threshold limit values (TLVs) in the worker's breathing zone. Local exhaust ventilation optimizes ventilation exhaust airflow, thus optimizing system operating costs.

The pollutant-capturing efficiency of local ventilation systems depends on hood design, the hood's position relative to the source of contamination, temperature of the source being exhausted, and exhaust airflow. Selection and position of the hood significantly influence initial and operating costs of both local and general ventilation systems. In addition, poorly designed and maintained local ventilation systems can cause deterioration of building structures and equipment, negative health effects, and decreased worker productivity.

Hood Types

Exhaust hoods are typically round, rectangular, or slotted to accommodate the geometry of the source. Hoods are either enclosing or nonenclosing. Enclosing hoods provide more effective and economical contaminant control because their exhaust rates and the effects of room air currents are minimal compared to those for nonenclosing hoods. A nonenclosing hood can be used if access requirements make it necessary to leave all or part of the process open. Careful attention must be paid to airflow patterns and capture velocities around the process and hood and to the process characteristics to make nonenclosing hoods effective. The more of the process that can be enclosed, the less exhaust airflow required to control the contaminants. Hood performance (i.e., how well it captures the contaminant) must be verified by an industrial hygienist.

If you are serious about getting a guaranteed solution that will work for years, we'll design for you Local Exhaust System that gives you optimum efficiency. Get the most out of your Exhaust System and keep your electric bill low. Contact our office at 416-663-0994 or our e-mail and we'll get your started in the right direction.

We will also retrofit existing Exhaust Systems. An overhaul of your Exhaust System could both increase its efficiency, and reduce maintenance and operating costs. It could be that you are not getting the full value of the equipment you already have.

We are committed to providing the service you need to ensure a successful and reliable project. Our engineers would be pleased to discuss your application. Feel free to call if you think we may assist you with your problems in this area.