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1. Shift to the center against the stop clamps 2 covers of 1 filter of a heater. |
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2. Uncover 1 down. Take out from the heater case the holder 2 with the filtering element. |
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4. Take out the filtering element 2 of the holder 1. |
| 5. Establish the new filtering element upside-down and reliably record a cover. |