The fire-resistant new plastic housing of the PK250-XLE is now flow-optimised to reduce the fan volume. The PK250-XLE has a German ebm-papst RadiCal impeller inside The radial impeller is equipped with backward curved blades, which also enables a large air flow in the case of negative pressure, as occurs in operation with filters. The motors have a maintenance-free and durable precision ball bearing, a thermal circuit breaker and are speed-controlled. The fans operate with extremely low noise emissions and have long exceeded the energy efficiency standard ERP2018. The pre-assembled Schuko connection cable makes commissioning easy. Stable fixing straps already fitted allow perfect positioning in the room.