WhisperKool ULTIMATE Series Owner's Manual page 32

FILTER REPLACEMENT PROCEDURE (FOR DUCTED UNITS)
AREA ENLARGED
Filter replacement procedure (for ducted units): First, unscrew
the four screws on the side of the condenser intake and cellar-
side return air plenum housings. Once the screws are removed,
remove the slender panels from the side of the plenum housings.
Slide the old filters out of duct plenums and replace them with
new ones. Replace panel and screws when finished.
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