FRAMED FILTER MODULES
1.Before laying
For protection and storage purposes, the frames are in cardboard boxes.

2.Laying procedure
Fit the frames on their supports, the course denier towards the operator (the mini-mesh towards the exhaust ventilation).
For better efficiency, open the course denier. Check this by moving your finger across the mesh of the filter from bottom to top, it should be rough. Otherwise, if your fingers smooth the mesh, turn the frame upside down.