The International Mechanical Code, 2021 Edition, is amended and changed in the following respects:
(A) Delete Chapter 1, Administration, in its entirety.
(B) Amend Section 401.2, Ventilation required, to read as follows:
Every occupied space shall be ventilated by natural means in accordance with Section 402 or if needed by mechanical means in accordance with Section 403.
(C) Amend Section 403.2.1, Recirculation of air, to read as follows:
The outdoor air provided by Section 403.3 shall not be recirculated. Air in excess of that provided by Section 403.3 shall not be prohibited from being recirculated as a component of supply air to building spaces, except that:
(1) Ventilation air shall not be recirculated from one dwelling to another or to dissimilar occupancies.
(2) Supply air to a swimming pool and associated deck areas shall not be recirculated unless such air is dehumidified to maintain the relative humidity of the area at 60 percent or less. Air from this area shall not be recirculated to other spaces where more than 10 percent of the resulting supply airstream consists of air recirculated from these spaces.
(3) Where mechanical exhaust is required by Note b in Table 403.3.1.1, recirculation of air from such spaces shall be prohibited. Recirculation of air that is contained completely within such spaces is prohibited, all air supplied to such spaces shall be exhausted, including any air in excess of that required by Table 403.3.1.1.
(4) Where mechanical exhaust is required by Note g in Table 403.3.1.1, mechanical exhaust is required and recirculation from such spaces is prohibited where more than 10 percent of the resulting supply airstream consists of air recirculated from these spaces. Recirculation of air that is contained completely within such spaces shall not be prohibited.
(D) Amend Section 403.3, Outdoor air and local exhaust airflow rates, to read as follows:
When group R-2, R-3 and R-4 occupancies three stories and less in height above grade plane are provided with outdoor air and local exhaust they shall be in accordance with Section 403.3.2. Other buildings intended to be occupied may be provided with outdoor air and local exhaust in accordance with Section 403.3.1.
(E) Section 508.1.1, Makeup air temperature. Delete this section in its entirety.
(F) Section 1101.9, Locking access port caps. Delete this section in its entirety.
(Ord. 3337, § 2, passed 9-27-2004; Ord. 3381, § 2, passed 10-24-2005; Ord. 3517, § 2, passed 5-11-2009; Ord. 3661, § 2, 11-28-2011; Ord. 3793, § 1, passed 12-8-2014; Ord. 4034, § 2, passed 5-4-2021)