Phoenix Pre‑Filter for Phoenix Guardian R Air Scrubber Duct Cleaning and rinse thoroughly — residue

and rinse thoroughly — residue left on a coil corrodes it between services

This premium REPLACEMENT HEPA filter is engineered for the Phoenix Guardian R Pro HEPA Air Scrubber System

Suitable for Hydramaster CDS 4

Judge an EPDM belt by how it sits in the pulley

Hang it from a handrail and the hose is off the treads while you work the stairs

Phoenix Pre‑Filter for Phoenix Guardian R Air Scrubber Duct Cleaning and rinse thoroughly — residueOverview First stage pleated pre filter, 1" 18" 18". Phoenix part number 4031877. It is the first filter the air meets in a Guardian R air scrubber, and its job is to protect the HEPA filter behind it. What it fits Phoenix Guardian R air scrubber named as item 1 in the Guardian R Pro 50 Hz service parts list, Air Filter, Pleated, 1" 18" 18" The filter stack, and why the order matters The Guardian R runs a staged filter arrangement: Stage 1 pre filter