The CTS OM-135 was a long range Supercharged omnidirectional siren. The siren itself is similar to a Thunderbolt, albeit with an omnidirectional design. The siren, while appearing to be pneumatic, is in fact supercharged as the rotor has vanes, allowing it to function without the blower, albeit at a much lower volume. The siren itself is an omnidirectional, 8 port siren driven by an AC electric motor. The blower is meant to be mounted directly below the siren's head, making it quite top heavy. This has led to incidents where a poorly supported OM-135 ends up being blown over by high winds, and as such installers are urged to take care when installing these sirens. Guy wires are included with the siren for additional stability on roof mounts. Due to its top-heavy and bulky nature, this siren is not suitable for pole mounting. The OM-135 is no longer in production, having been replaced by the POM-125.
CHARACTERISTICS
The siren itself has 8, large, non-aerodynamic horns. These horns require supports because the horns were made of steel and are thus quite heavy. It uses a dainty 4M blower, which is belt-driven by a separate AC motor. The blower is placed below the siren head, in a similar fashion to a Model 120. The blower also serves as the siren's stand. The rotor and stator are small, in order to put less strain on the blower. The AC electric motor is air cooled, making the shroud have holes in it. The motor is protected by a cylindrical motor cover, with a rainshield on top.