The pre-filters goes down in the 500 m3 and 700 m3 filter machines and catches the coarse dust particles. The pre-filter protects the expensive HEPA and carbon filter cassettes. Replace the pre-filters regularly.
G3 pre-filter - PA500-01 410 x 410 x 5 mm.
for dust particles> 5 micron
replacement frequency: ~ 1x per week
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