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.

In the UMC regarding a room containing the refrigerant compressors for a large grocery store: 1. When the refrigerant quantities in a single system exceed the amounts in Table 11-1 for a single system, which would otherwise require a refrigeration machinery room, can the room be designed so that it is open to either the main floor or other areas that are large enough to meet the allowable quantities as shown in Table 11-1 to eliminate the need for the refrigeration machinery room? 2. Does footnote 7 of Table 11-1 indicate that this table, pounds per 1000 cubic feet of occupied space, is not applicable for determining when a refrigeration machinery room is necessary?