ECE 4-Stage HEPA Filter FFU (with Primary, Secondary, Activated Carbon and HEPA Filters)
These Fan Filter Units have the same specifications as per Dual Stage Fan Filter Units but with two additional filtration stages of Activated Carbon Filters and HEPA filters added.
Each unit consists of:
Washable Primary Panel Filters (ASHRAE efficiency >20%),
Secondary Synthetic Pocket Filters (ASHRAE efficiency 95%)
Activated Carbon Filters
HEPA Filters (high efficiency filters)