Usage/ApplicationProper installation of the pre-filter on the HAKKO FA-430 HEPA Compact Fume Extraction UnitProper installation Install the pre-filter inside the frame of the main filter as shown in image 1. Be sure to check that there are no gaps at the corners as shown in image 2. Improper installation If the pre-filter is not installed properly as shown in images 3 and 4, the main filter will degrade its original performance quickly. Categories: Filters, Fume extractors, HAKKO, Product catalogue, Shop by brand Tags: FA400, FA430, FA430-13, Pre-filters