Miscellaneous Exhaust Testing
Miscellaneous exhausts are used for many different functions in a multitude of settings. The most common functions of miscellaneous exhausts include capturing heat, nuisance odors, and dust or other particulate debris from manufacturing or cleaning processes.
Some exhausts that fall under the category of miscellaneous exhausts include:
Drop exhausts
Trunk exhausts
Table exhausts
Canopy exhausts
Down draft tables
Barrel exhausts
Custom exhausts
Although exhausts that are primarily used to remove heat and odor do not have official guidelines set for recommended velocities or capture distances, there are many benefits to having this type of equipment tested as a part of your annual maintenance process.
Annual testing helps confirm that there has been no drastic changes in the exhaust function from year to year. Changes in exhaust may indicate that the motor is in need of maintenance, that the exhaust itself has gotten clogged with dust and debris, etc. Oftentimes, without the installation of a magnehelic gauge or other duct pressure monitoring device, there is no easy well to tell if an exhaust has decreased. This can lead to unwanted exposures in the work environment. On the other end of this spectrum, exhausts that have velocities that are too great can become very expensive as they are cycling out large amounts of conditioned air.
HSSU tests and documents the exhaust velocity and uses a visual smoke test to confirm that the exhaust is functioning properly for it's designed use.