Potter Fire Alarm Systems User Manual
Page 19
17
Fire Alarm Training • 8700055 • Rev F • 4/10
ANYWHERE
IN THIS AREA
900mm
(3 ft)
900mm
(3 ft)
1/2 S
S
S
1/2 S
S
= SPACE BETWEEN DETECTORS
= SMOKE DETECTOR OR HEAT DETECTOR
DWG# 55-5
DO NOT
INSTALL
WITHIN 4”
OF PEAK
Raised Floors and Suspended Ceilings
Spaces between raised floors and above suspended ceilings shall be treated as separate rooms for smoke detector spacing
purposes. Detectors installed beneath raised floors or above suspended ceilings used for environmental air, shall not be used in
lieu of providing detection within the room. NFPA 72 2007, 5.7.3.7
To minimize dust collection, smoke detectors, where installed under raised floors, detectors shall only be mounted in an
orientation in which they been listed. NFPA 72 2007, 5.7.3.2.2
Detectors shall not be installed until after the construction cleanup of all trades is complete and final.
Exception: Where required by the authority having jurisdiction for protection during construction. Detectors that have been
installed during construction and found to have a sensitivity outside the listed and marked sensitivity range shall be cleaned or
replaced in accordance with Chapter 10 at completion of construction. NFPA 72 2007, 5.7.1.11
Smoke detectors can be installed on the ceiling or wall. When installed on a ceiling, no portion of the detector may be within 4” of a sidewall.
Ceiling 4”
Wall
No portion of a detector may
ever be installed in this triangle.
This is considered “Dead Air”
When installed on a wall, no portion of the detector mey be installed within 4” of the ceiling. Some portion of the detector must
be within 4”-12” of the ceiling.
Ceiling
4”
Some portion of the
detector must be
installed in this.
12”