Noise reduction during cleaning pulse depending on filter element type and dust density.

Measured at 1 m distance in front of the filters
Light dust / thin filter material: 0 dB(A)
Heavy dust or thick filter material: more than 10 dB(A) for FMK25 Cassette Filter.

The insulation box may be equipped with trace heating cables for very cold environment.
Material: galv. steel plate