Magma P13RR - Manual (Page 35)

M A G M A
Chapter 6 Maintenance
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Next, open the faceplate and remove the foam filter, located behind the
faceplate, and clean it with a solution of warm water and mild dish soap.
Finally, replace the filter and faceplate. Secure faceplate with four
Phillips screws. Tighten screws until snug. Turn on power to the
chassis.