Current through Register Vol. 49, No. 13, September 23, 2024
Subpart
1.
Section 403.1 Ventilation system.
IMC section 403.1 is amended to read as follows:
403.1
Ventilation 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:
403.3
Outdoor 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.
Statutory Authority: MS s 16B.59; 16B.61;
16B.64;
326B.101;
326B.106;
326B.13
