Prefilter
Prefilter is generally used for fresh air pre-filtration. With non-woven fabric or carbon as filtering material,
they can capture dust particles of more than 5um. They conforms to EN 1882, enjoying G4 - F5 filtering class.
The frames are generally made of anodized aluminum. The filters are light weight and high efficient with high
dust holding capacity so as to reduce operating cost and decrease the frequency of filter replacement.