Minn. R. agency 151, ch. 1346, MINNESOTA MECHANICAL CODE, pt. 1346.0403

Current through Register Vol. 49, No. 12, September 16, 2024

Part 1346.0403 - MECHANICAL VENTILATION

Subpart 1.Section 403.1 Ventilation system.

IMC section 403.1 is amended to read as follows:

403.1Ventilation system. Mechanical ventilation shall be provided by a method of supply air and return or exhaust air The amount of supply air shall be approximately equal to the amount of return and exhaust air The system shall not be prohibited from producing negative or positive pressure. The system to convey ventilation air shall be designed and installed in accordance with chapter 6.

Subp. 2.Section 403.3 Outdoor air and local exhaust airflow rates.

IMC section 403.3 is amended to read as follows:

403.3Outdoor air and local exhaust airfow rates. Group R-2, R-3, and R-4 occupancies three stories and less in height above grade plane shall be provided with outdoor air and local exhaust in accordance with section 401.2.2. Other buildings intended to be occupied shall be provided with outdoor air and local exhaust in accordance with section 403.3.1.

Subp. 3.Sections 403.3.2 to 403.3.2.5.

IMC sections 403.3.2 to 403.3.2.5 are deleted in their entirety.

Subp. 4.Section 403.3.1.

IMC Section 403.3.1 is amended to read as follows:

403.3.1 System operation. The minimum flow rate of outdoor air that the ventilation system must be capable of supplying during its operation shall be permitted to be based on the rate per person indicated in the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, and the actual number of occupants present.

Subp. 5.Section 403.3.4.

IMC Section 403.3.4 is amended to read as follows:

403.3.4 Balancing. Ventilation systems shall be balanced in accordance with amended IMC Section 309.2.

Minn. R. agency 151, ch. 1346, MINNESOTA MECHANICAL CODE, pt. 1346.0403

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537; 44 SR 1085

Statutory Authority: MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13