Injectidry Interceptor replacement HEPA filter Injectidry Replacement Interceptor HEPA Filter What the Interceptor is protectingThe Interceptor sits between the wall cavity and the blower. Cavity air carries dust, insulation fibre and — on a category 2 or 3 loss, or a mould job — biological material. The HEPA filter is what stops that going through the machine and out into the room the occupants are living in.Change it on condition, not on hopeA loaded HEPA filter does not stop filtering, it stops flowing. The system quietly loses the airflow the drying plan assumed, and the readings stall for no visible reason.Fit pre-filters in front of it. A pre-filter costs a fraction of a HEPA and takes the bulk load, which is what makes the HEPA last. Handle a used HEPA as contaminated wasteEverything the filter caught is still in it. Bag it on removal rather than carrying it out through the house — on a mould or sewage job that is not a formality. Injectidry parts are system-specific — HP and Direct-It use different connections. Tell us which system you run and we will confirm the part before you order.