Home Code News IAPMO Standards Council Issues TIAs UMC-004-09 and UMC-005-09

IAPMO Standards Council Issues TIAs UMC-004-09 and UMC-005-09

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The IAPMO Standards Council on Oct. 15 issued two Tentative Interim Amendments affecting the 2009 Uniform Mechanical Code (UMC©), TIAs UMC-004-09 and UMC-005-09.

TIA UMC-004-09 adds maximum air velocity for grease ducts to Section 511.2.1 of the UMC, which now reads: “The air velocity through any duct shall be not less than 500 feet per minute (152.4 meters per minute) and not more than 2,500 feet per minute (457.2 m per minute).” (The underlined portion has been added to the previous code language.)

TIA UMC-004-09 was balloted through the Mechanical Technical Committee in accordance with the Regulations Governing Committee Projects to determine if there existed the necessary three-fourths majority support on technical merit and emergency nature to establish the recommendation for issuance. The letter ballot passed on both accounts.

The Standards Council similarly voted favorably to approve UMC-005-09, striking of language from and adding new footnotes to UMC Table 11-2, Permissible Refrigeration Systems. The new table provides direct correlation for the occupancies with the building code and adds footnotes 3 and 4, respectively:
• The allowable quantities shown in Table 11-1 shall be reduced by 50 percent for all institutional occupancies except kitchens, laboratories and mortuaries
• Occupancy classifications are defined in the Building Code.

TIA UMC-005-09 was balloted through the Mechanical Technical Committee in accordance with the Regulations Governing Committee Projects to determine if there existed the necessary three-fourths majority support on technical merit and emergency nature to establish the recommendation for issuance. The letter ballot passed on both accounts.

To examine TIAs UMC-004-09 and UMC-005-09 in their entirety, and/or any other TIAs affecting the Uniform Codes, please direct your Web browser here.

TIAs are proposals based on the determination of an emergency nature requiring prompt action to amend code that contains an error or omission that was overlooked during the regular code development process, contains a conflict within the document or with another IAPMO document, or to correct a hazard, promote an advancement in safeguarding the public or provide an opportunity to correct an adverse impact on a product or method of installation.

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