Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 187)

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7. Maintenance
2. Remove the filter unit by pulling out the tab.
Filter unit Tab
3. Remove the four filters.
Hold and remove the filters fitted to the two sides of the filter unit.
4. Use a vacuum cleaner to vacuum all the dust inside.
Get rid of dust in the filter.
NOTE:
• Whenever you vacuum the filter, use the soft brush attachment to vacuum. This is to
avoid damage to the filter.
• Do not wash the filter with water. Doing so can result in filter clogging.
5. Remove the dust on the front and back of the filter unit.
• Please also remove all dust from the filter cover of the projector.