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453.4.7.4 Laboratory Suite Exhaust Air
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Exhaust air from laboratory suites shall not be recirculated.
Laboratory suite exhaust air shall be independently ducted to a point outside the building or a roof top structure.
Exceptions:
- Exhaust ducts serving a single laboratory suite.
- Exhaust ducts serving separate laboratory suites on the same story may be connected to a common duct within a fire rated vertical shaft when the sub-duct extends vertically upward at least 22 inches.
- Exhaust ducts serving separate laboratory suites on the basement through the 4th story may be connected to a common duct within a fire rated vertical shaft when the sub-duct extends vertically upward at least 22 inches.
- Exhaust ducts serving separate laboratory suites on the 5th story and above may be connected to a common duct that does not exceed 100 vertical feet within a fire rated vertical shaft when the subducts extends vertically upward at least 22 inches. Ducts serving the 5th story and above shall be separate from the duct serving the 4th story and below, but may be within the same fire rated shaft.
Laboratory suite exhaust ducts shall not penetrate the 2-hour fire barrier required by Section 453.4.3.
Exception: Where the exhaust duct is enclosed in a 2-hour shaft in accordance with Section 708.
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