Bunker equipment which was used for air intake, ventilation and heating :

electrical ventilation and air filter

airheater

HES 1.2 with Dräger filter elemets

another HEs 1.2

closedup of the VW-Filter

coal oven to heat the air

Dräger Raumfiler- used in  big underground systems

WT 80K  WT 80 manual !

another WT 80K 

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