N.Y.C. Admin. Code § EBC 909: Section EBC 909: Mechanical

909.1 General.

Mechanical elements and systems within work areas in buildings undergoing a Level 2 alteration shall comply with Section 309, Section 809 and this section.

909.2 Applicability of New York City Mechanical Code.

Where an existing building is undergoing a Level 2 alteration, all existing mechanical systems within the work area, including components, equipment and appliances, shall comply with the New York City Mechanical Code, this section and Section 809.2 of this code.

909.2.1 Ventilation.

Ventilation systems serving work areas of a Level 2 alteration shall be newly installed or altered to comply with requirements of Chapter 4 of the New York City Mechanical Code for new construction.

909.2.2 Exhaust systems.

Exhaust systems serving work areas of a Level 2 alteration shall be newly installed or altered to comply with requirements of Chapter 5 of the New York City Mechanical Code for new construction.

909.2.3 Compliance of ventilation, exhaust, and duct systems as new construction.

Where the building is undergoing a Level 2 alteration and the work area exceeds 75 percent of the building floor area, all ventilation, exhaust and duct systems shall be newly installed or altered to comply with the provisions of Chapters 4, 5 and 6 of the New York City Mechanical Code for new construction.