Clean the upper filter screen frame
Clasp the wedging block of the EVA filter screen frame with hands. Force down from
the outside to remove the EVA filter screen frame. Unscrew four screws fixing the EVA
filter screen and the Rear Housing to remove the EVA filter screen (as shown in the
figure below).
Put the EVA filter screen into warm water with neutral detergent (about 40°C/ 104°F)
and dry it in the shade after rinsing clean.
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