// CODE SNIPPET
C405.2.3.2 Sidelit Zone
JUMP TO FULL CODE CHAPTER

The sidelit zone is the floor area adjacent to vertical fenestration that complies with all of the following:
- Where the fenestration is located in a wall, the sidelit zone shall extend laterally to the nearest full-height wall, or up to 1.0 times the height from the floor to the top of the fenestration, and longitudinally from the edge of the fenestration to the nearest full-height wall, or up to 2 feet (610 mm), whichever is less, as indicated in Figure C405.2.3.2.
- The area of the fenestration is not less than 24 square feet (2.23 m2).
- The distance from the fenestration to any building or geological formation that would block access to daylight is greater than the height from the bottom of the fenestration to the top of the building or geologic formation.
- The visible transmittance of the fenestration is not less than 0.20.
SIDELIT ZONE
Related Code Sections
C405.2.3.2 [CE] Commercial Energy Efficiency, Sidelit Zone
The sidelit zone is the floor area adjacent to vertical fenestration that complies with all of the following: Where the fenestration is located ...
Energy Conservation Code 2018 of Massachusetts > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls (Mandatory) > C405.2.3 Daylight-Responsive Controls > C405.2.3.2 Sidelit Zone
C402.4.4 [CE] Commercial Energy Efficiency, Daylight Zones
zones shall include toplit zones and sidelit zones ...
Energy Conservation Code 2018 of Massachusetts > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.4 Fenestration (Prescriptive) > C402.4.4 Daylight Zones
(3) Special Occupancies, Zone
2. A Zone 2 location is a location In which ignitible concentrations of flammable gases or vapors are not likely to occur in normal operation ...
527 CMR 12.00: MA Electrical Code > 5 Special Occupancies > 505 Zone 0, 1, and 2 Locations > 505.5 Classifications of Locations > (B) Zone 0, 1, and 2 Locations > (3) Zone
907.6.3 Fire Protection Systems, Zones
Each floor shall be zoned separately and a zone shall not exceed 22,500 square feet (2090 m 2 ). The length of any zone shall not exceed 300 feet (91 ...
MA State Building Code, 8th ed, Base Volume > 9 Fire Protection Systems > 907 Fire Alarm and Detection Systems > 907.6 Installation > 907.6.3 Zones
907.6.4 Fire Protection Systems, Zones
Each floor shall be zoned separately and a zone shall not exceed 22,500 square feet (2090 m 2 ). The length of any zone shall not exceed 300 feet (91 ...
MA State Building Code, 9th ed, Base Volume > 9 Fire Protection Systems > 907 Fire Alarm and Detection Systems > 907.6 Installation and Monitoring > 907.6.4 Zones