48detectors must be connected to an alarm verification zone or be
listed as a releasing device.
2. In the main return -air and exhaust -air plenum of each air-
conditioning system. Such device must be located in a serviceable
area downstream of the last duct inlet.
3. At each connection to a vertical duct or riser serving two or more
stories from a return -air duct or plenum of an air conditioning
system. In Group R -1 and R -2 Occupancies, an approved smoke
detector may be used in each return -air riser carrying not more than
5,000 cubic feet per minute and serving not more than 10 air inlet
openings.
4. For Group R -1 and R -2 Occupancies, in all corridors serving as a
means of egress for an occupant load for 10 or more.
§ 915.3.4 Smoke Control. A smoke control system must be provided for all mid -rise
buildings whenever a complete floor is in excess of 55 feet (16.764 mm) from the
lowest point of Fire Department access. Such system must be mechanical and must
be designed, installed and tested to be in compliance with Section 909.
§ 915.3.5 Fire Alarm System. An approved and listed, automatic and manual, fully
addressable and electronically supervised fire alarm system must be provided in
conformance with this code and any policies of the Fire Prevention Division.
§ 915.3.6 Emergency voice alarm signaling system. The operation of any
automatic or manual fire alarm initiating device must automatically sound an alert
tone followed by a pre- recorded voice instruction giving appropriate information and
direction on a general or selective basis to entire building, occupied and normally
non - occupied areas.
§ 915.3.6.1 Pre - recorded instructions. The content of the voice alarm instruction
must be approved by the El Segundo Fire Department.
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