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Friedrich SS12M30 Filter
The filter in the wall unit has the main responsibility for filtering tiny dust fragments and other small elements as it is being forced through the system. This can both keep the unit dust-free and help it be more efficient while also filtering the air breathe in and out everyday. While doing regular cleaning of the houseZZZcommmaZZZ the filter should be simply replaced or possible scrubbed clean a few times a year depending on how much you use it.
Red flags your main filter needs replacing ASAP
- The system air filter looks brown and replacing it would be best real soon
- Many pros have suggested to replace your air filter four times a year to help clean the indoor air
- If you place a light source behind it, the light will not shine on the opposite side of a completely clogged filter
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