A versatile duct – Feifel system

The name Feifel will ring a bell for many a Tiger tank fan. Feifel is the name of the air filtration system used on early Tigers, and is named after the engineer, professor Feifel, who pioneered the principle of the cyclone pre-filter. This type of filter was intended for use in very dusty or polluted environments where oil filters alone were ineffective. The filters were initially used on the Tigers of the schwere Panzer-Abteilungen 501 and 504 in North Africa and later also with various units on the eastern front.

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