UpCodes logo
Jump To Full Code Chapter
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. Louvers that protect air intake openings in structures located in hurricane-prone regions, as defined in the International Building Code, shall comply with AMCA 550. Outdoor air intake openings located in exterior walls shall meet the provisions for exterior wall opening protectives in accordance with the International Building Code.
TABLE 401.5
OPENING SIZES IN LOUVERS, GRILLES AND SCREENS PROTECTING AIR INTAKE OPENINGS
OUTDOOR OPENING TYPE MINIMUM AND MAXIMUM OPENING SIZES IN LOUVERS, GRILLES AND SCREENSa
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.
  1. For rectangular openings, the table requirements apply to the shortest side. For round openings, the table requirements apply to the diameter. For square openings, the table requirements apply to any side.

Related Code Sections

401.5 Ventilation, Intake Opening Protection
Air intake openings that terminate outdoors shall be protected with corrosion-resistant screens, louvers or grilles. Openings in louvers, grilles ...
401.5 Ventilation, Intake Opening Protection
Air intake openings that terminate outdoors shall be protected with corrosion-resistant screens, louvers or grilles. Openings in louvers, grilles ...
401.5 Ventilation, Intake Opening Protection
Air intake openings that terminate outdoors shall be protected with corrosion-resistant screens, louvers or grilles. Openings in louvers, grilles ...