The foldaway shutters or to drawer have the merit to leave completely free the section of passage in open position. The pin turns on bearings and the diaphragm is on seal with felt on pneumatic model.
The production of the silent compressor, with noisiness 40-45 decibel, is born from the demand to work inside small environments with machineries or equipments for hobbies.
Various experimentations to silence the traditional compressors have improved the noisiness bringing it from 75 dbs in general to the 65 dbs with the silenced models.
