401.4.1 Required dampers in intake openings.

Outdoor air intakes shall be provided with dampers in accordance with Chapter 6.

401.5 Intake opening protection.

Air intake openings that terminate outdoors shall be protected with corrosion-resistant screens, louvers or grilles. Openings in louvers, grilles and screens shall be sized in accordance with Table 401.5, and shall be protected against local weather conditions. Outdoor air intake openings located in exterior walls shall meet the provisions for exterior wall opening protectives in accordance with Section 705 of the New York City Building Code.

Table 401.5
Opening Sizes in Louvers, Grilles and Screens Protecting Outdoor Exhaust and Air Intake Openings

 

Outdoor Opening Type	Minimum and Maximum Opening Sizes in Louvers, Grilles and Screens Measured in Any Direction
Intake openings in residential occupancies	Not < 1/4 inch and not > 1/2 inch
Intake openings in other than residential occupancies	> 1/4 inch and not > 1 inch

 

For SI: 1 inch = 25.4 mm.

Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2014/051.

401.6 Contaminant sources.

Stationary local sources producing air-borne particulates, heat, odors, fumes, spray, vapors, smoke or gases in such quantities as to be irritating or injurious to health shall be provided with an exhaust system in accordance with Chapter 5 or a means of collection and removal of the contaminants. Such exhaust shall discharge directly to an approved location at the exterior of the building.

401.6.1 Wind-driven rain.

All exterior louvers for building ventilation systems shall conform to the requirements of Chapter 16 of the New York City Building Code, where applicable, and the following:

   1.   Comply with the requirements of AMCA 550. Louvers shall comply with the intrusion requirements of wind-driven rain without the use of a damper. Outdoor air intake openings located in exterior walls shall meet the provisions for exterior wall opening protectives in accordance with Chapter 16 of the New York City Building Code; or

   2.   Be installed on a plenum configured to intercept any wind-driven rain penetrating the louver and to prevent the rain from entering the building ductwork system. Such plenum shall be waterproofed and equipped with a drainage system to convey water penetrating the louver directly to the outdoors or in accordance with the New York City Plumbing Code.

Section MC 402: Natural Ventilation

402.1 General.

Natural ventilation of occupiable and habitable spaces shall comply with Chapter 12 of the New York City Building Code.