Profile: Sentry Siren, Inc. specializes in providing warning sirens. We also specialize in designing custom siren systems. Model 3V8-H outdoor warning siren is a power packed, entry level unit. With its low power demands this bullet-proof performer is meant for small cities and small volunteer fire departments. Normally used for single siren installations. This 5 horsepower performer is rated at 109 dB(c) at 100 ft. It is available in single or three phase power and can be upgraded to battery functions by selecting its big brother, the 7V8-B. All exposed siren components are of powder coated metals, providing the most durable finish available. The siren can be upgraded to stainless steel for use in harsh environments. Our F-2 industrial siren is used in a wide range of industrial, municipal, and a variety of other emergency signaling applications. The F-2 employs a carefully machined & balanced aluminum fan & housing, and aluminum, powder coated projectors. The air intake is screened to protect against foreign matter. Corrosion protected, it is suitable for indoor or outdoor installation.