Ladder Type
A ladder tray is another type of ventilator tray, which has the cables supported by a traverse bar, similar to the rungs of a ladder, at regular intervals on the order of 4 to 12 inches (100 to 300 mm). The rungs provide convenient anchors for tying down the cables in the non-horizontal cable tray runs. Cables may exit or enter the ladder cable trays through the top or the bottom of the cable tray. Ladder cable trays do not allow moisture accumulation.
Ladder and ventilated trays may have solid covers to protect cables from falling objects, dust, and water. Tray covers for use outdoors or in dusty locations may have a peaked shape to shed debris including dust, ice or snow.
