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The International Association of Plumbing and Mechanical Officials has been protecting the public’s health and safety for ninety years by working in concert with government and industry to implement comprehensive plumbing and mechanical systems around the world.

As a membership-based association, IAPMO is proud to utilize an open consensus process in the development of our flagship Uniform Plumbing Code® and Uniform Mechanical Code®. These codes are established through scientific research, debate, and analysis, strengthening our position at the forefront of the plumbing and mechanical industries.

The IAPMO Group is a complete service organization, providing code development assistance, industry-leading education, plumbing and mechanical product testing and certification, building product evaluation and a manufacturer-preferred quality assurance program. Each component of the IAPMO Group works toward playing an integral part in protecting the health of people everywhere.

Responding to a request, we are making some of the online Answers and Analysis offered only to IAPMO members available here.

I am working in a project in Davis, CA where a restaurant with cooking appliances will be installed in the first floor of a 4-story building. The exhaust hood (type 1) installed above the cooking appliances is connected to a Pollution Control Unit (PCU), which will remove grease, vapors, smoke, etc from the airstream before discharging it to the outside. The building has no shaft and I am proposing to discharge the air from the PCU through the side wall. My question is, From California Mechanical Code (CMC) perspective ……. is the air coming from the PCU and discharged to the outdoor considered to be “environmental air”? Comment As part of the permit approval process, the Fire Dept in Davis, CA is asking me to provide them with a definition of “environmental air” but I could not find it in the 2010 CMC. They want to know “hard” numbers such as maximum concentration (in %) of pollutants allowed in an airstream in order to be considered “environmental”. I checked unsuccessfully many Internet sites and then decided to ask for your help in finding such definition. CMC only defines “environmental air duct” but it is not enough for Davis Fire Dept. Can you please provide such definition or let me know where I can find it?
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