909. VENTILATION

909 VENTILATION Strike Section 909.1 of the International Existing Building Code in its entirety and insert new Section 909.1in its place in the Existing Building Code to read as follows. 909.1 Ventilation required. Where an existing dwelling unit is undergoing a Level 3 alteration and its air infiltration rate is less than five (5) air changes per hour when tested with a blower door at a pressure of 0.2 inch water column (50 Pa) in accordance with Section R402.4.1.2 of the Energy Conservation Code, the dwelling unit shall be ventilated by mechanical means in accordance with Section 403 of the Mechanical Code. SOURCE: Final Rulemaking published at 68 DCR 7439 (July 30, 2021). The District of Columbia Existing Building Code (2017), referred to as the “Existing Building Code,” consists of the 2015 edition of the International Existing Building Code (International Existing Building Code), published by the International Code Council (ICC), as amended by the Existing Building Code Supplement of 2017 (12-J DCMR). The International Existing Building Code is copyrighted by the ICC and therefore is not republished here. However, a copy of the text may be obtained at: https://codes.iccsafe.org/public/public/collections/. District of Columbia Municipal Regulations Existing Building Code Supplement of 2017 12-J DCMR § 909