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2014 Mechanical Code Clarifies Ventilation Control   Publish Date: 3/1/2015

2014 Mechanical Code Clarifies Ventilation Controls for Enclosed Parking Garages

The 2014 Oregon Mechanical Code clarifies the automatic operation of intermittent mechanical ventilation systems for enclosed parking garages in accordance with the Energy Code. Carbon monoxide (CO) detectors in conjunction with nitrogen dioxide (NO2) detectors shall be applied to automatically operate the ventilation system.

Ventilation systems must meet the minimum requirement of 0.05 cfm/ft2 of floor area and be capable of producing a ventilation airflow rate of 0.75 cfm/ft2 of floor area when higher concentrations of gas are detected. Enclosed parking garages having ventilation rates of 30,000 cfm or higher shall employ automatic CO and NO2 sensing devices. These devices shall modulate the ventilation system to maintain a maximum concentration of 50 ppm during any 8 hour period and 200 ppm for any 1 hour period. Failure of such devices shall cause the fans to operate in the ON position.

Toxalert International offers a new monitoring and control system, TOX-NET, which provides an ideal solution for enclosed parking garage applications. Some of its features and benefits include:

  • Central controller serves up to 99 sensors
  • Controller connects to sensors by single wire run
  • Analog outputs for fan VFD
  • Data logging of fan runtime
  • Optional alarm with silence
  • Modbus interface
  • Plug in electrochemical sensors (CO, NO2, and more)

For more information on Toxalert’s TOX-NET system, click here.