Specification

Architect & Engineering Specifications
The photoelectric smoke alarm shall be a Gentex model 913/913T or approved equal which shall provide at least the following features
and functions:
1. Nominal sensitivity of 2.5%
2. The alarm shall utilize an infrared LED sensing circuit which pulses in 4 to 5 second intervals when subjected to smoke. After 2
consecutive pulses in smoke, the alarm will activate.
3. The alarm shall provide an indication when the battery is low.
4. The alarm shall provide minimum 5-to-1 signal-to-noise ratio in the optics frame to assure stability of operation in environments of
high RF and transient conditions.
5. The sensing chamber shall be fully protected to prevent entrance of small insect, thus reducing the probability of false alarms.
6. A solid state piezo alarm rated at 85dBA at 10ft.
7. An easily accessible test knob shall be provided. The test knob in the TEST position will simulate an actual smoke condition of
approximately 3.5% causing the detector to alarm within 20-36 seconds. It will also have the capability of testing to 0.85% as a required
minimum. A magnetic switch closure or smoke generating equipment which does not scatter the light beam or test sensitivity is not
sufficient as indicated in National Code.
8. Units shall be listed by Underwriters Laboratories (UL) and California State Fire Marshal (CSFM)
The 913 Series photoelectric smoke alarm operates on the photoelectric light scatter principle. The unit's sensing chamber houses a light
source and a light sensor. The darkened sensing chamber is exposed to the atmosphere and designed to permit optimum smoke entry
from any direction while rejecting light from outside the alarm. The light source is an infrared (invisible) LED which pulses every 8 seconds.
The light sensor is a photodiode matched to the light frequency of the LED light source.
Under normal conditions, the light generated by the pulsing infrared LED is seen by the light sensor, as it is positioned out of the direct
path of the light beam. When smoke enters the sensing chamber, light from the pulsing LED light source is reflected by the smoke particles
onto the photodiode light sensor. At the first sighting of smoke, the alarm is put into a pre-alarm mode. This is indicated by the rapidly
flashing LED on the face of the alarm. Once the light sensor confirms smoke for 2 consecutive pulses inside the chamber, the light sensor
produces the signal necessary to trigger the alarm.
This technique of verifying the smoke condition, combined with a 5 to 1 noise ratio, substantially reduces the possibility of nuisance
alarms.
Battery Installation
1. Once the smoke alarm is mounted, the cover can be opened by
using the pull tab located on right side of cover.
2. NOTICE: USE ONLY DURACELL
®
MN 1604 BATTERY WITH THE
913 SERIES SMOKE ALARMS.
3. Connect battery to terminals located near upper right-hand corner
inside the smoke alarm after first resetting battery removal flag back
to its stand-by condition.
4. Close smoke alarm by snapping cover shut.
5. After battery has been installed or replaced, test smoke alarm.
24 units per carton
32 pounds per carton
913-01
Important Notice:
These materials have been prepared by Gentex Corporation ("Gentex") for informational purposes only, are
necessarily summary, and are not purported to serve as legal advice and should not be used as such. Gen-
tex makes no representations and warranties, express or implied, that these materials are complete and ac-
curate, up-to-date, or in compliance with all relevant local, state and federal laws, regulations and rules. The
materials do not address all legal considerations as there is inevitable uncertainty regarding interpretation of
laws, regulations and rules and the application of such laws, regulations and rules to particular fact patterns.
Each person's activities can differently affect the obligations that exist under applicable laws, regulations or
rules. Therefore, these materials should be used only for informational purposes and should not be used as
a substitute for seeking professional legal advice. Gentex will not be responsible for any action or failure to
act in reliance upon the information contained in this material.
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S E R I E S