NEC PH3501QL User Manual page 142

2. Remove the air filter.
(1) Press the stopper button (2 places).
(2) Pull the top part of the air filter towards you. Once you
have freed the upper half of the air filter, remove the
filter by pulling it diagonally upwards.
3. Lift the air filter in the direction of the arrow and re-
move it.
4. Remove the air filters.
(1) Slide the upper air filter to the position shown below.
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7. Maintenance