I. INTRODUCTION
The Gentex Model ST/HS, strobe and horn/strobe, is a high quality visible (ST) or audible/visible (HS) signaling appliance. The high intensity strobe
utilizes a Xenon flash tube that generates a high-intensity flash visible from all angles. This appliance is intended to provide a visible or audible/visible,
depending on the model, notification signal for the purpose of life safety and property protection. This appliance is ideal for hotels, apartments,
hospitals, rest homes or wherever dependable alarms are required. The strobe is listed in compliance with UL 1971, Signaling Appliances for the
Hearing Impaired and CAN/ULC S526-M87 Visible Signal Devices for Fire Alarm Systems (15/75 Cd model is additionally listed in compliance with
UL 1638).
II. LOCATION
This appliance is intended for use in Fire Alarm Systems and is to be installed in accordance with this manual, the recommendation of the local
authorities having jurisdiction, and other NFPA documents that provide standards on notification appliances for protective signaling systems. The
ST/HS is intended for indoor installations only. This appliance is not weatherproof for outdoor or drip proof applications.
Wall mounted strobe and horn/strobe appliances shall have their entire lens at heights above the finished floor of not less than 80 in. (2m) and not
greater than 96 in. (2.4m)**. Spacing shall be in accordance with Table A. If a room configuration is not square, the room size that will entirely
encompass the room or subdivide the room into multiple squares shall be used.
Wall mounted horn only appliances shall have their tops above the finished floors at heights of not less than 90 in. (2.30m) and below the finished
ceilings at heights of not less than 6 in. (152mm). Different mounting heights shall be permitted by the AHJ provided the sound pressure level
requirements of NFPA 72 are met.
greater than or equal to 24" 110cd
less than 24" 177cd
ST AND HS SERIES
UL 1971 COMPLIANT
CAN/ULC S526-M87 Compliant
VISIBLE AND AUDIBLE/VISIBLE SIGNALING APPLIANCES
**Effective Intensity Requirements for Sleeping Areas
Visible Notification Appliance
Distance from Ceiling to Top of Lens Intensity
Pg. 1
Two Lights per Four Lights per
Meters Feet One Light Room (Located on Room (One Light
per Room Opposite Walls) per Wall)
6.10 x 6.10 20 x 20 15 NA NA
8.53 x 8.53 28 x 28 30 Unknown Unknown
9.14 x 9.14 30 x 30 34 15 NA
12.2 x 12.2 40 x 40 60 30 15
13.7 x 13.7 45 x 45 75 Unknown Unknown
15.2 x 15.2 50 x 50 94 6 30
16.5 x 16.5 54 x 54 110 Unknown Unknown
18.3 x 18.3 60 x 60 135 95 30
21.3 x 21.3 70 x 70 184 95 60
24.4 x 24.4 80 x 80 240 135 60
27.4 x 27.4 90 x 90 304 185 95
30.5 x 30.5 100 x 100 375 240 95
33.5 x 33.5 110 x 110 455 240 135
36.6 x 36.6 120 x 120 540 305 135
39.6 x 39.6 130 x 130 635 375 185
Maximum Room Size Minimum Required Light Output (Effective Intensity, Cd)
Table A
NA = Not Allowable
