Kuwait has an entire siren system of. They once had an entire system of Thunderbolt system 7000's, until they all got replaced. However, one System 7000 remains on display. Iran & Iraq, since the 80's, they got a whole system of the Pneumatic sirens made by Hörmann, specifically, the Hörmann HLS 273, and Iraq replaced them for Comtel manufactured sirens.
Several types of tray are used in different applications. A solid-bottom tray provides the maximum protection to cables, but requires cutting the tray or using fittings to enter or exit cables. A deep, solid enclosure for cables is called a cable channel or cable trough. A ventilated tray has openings in the bottom of the tray, allowing some air circulation around the cables, water drainage, and allowing some dust to fall through the tray. Small cables may exit the tray throug.
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