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Friedrich SL28 Filter
The unit filter was created for filtering minute dust particles and other miniscule particles as it passes through. This helps keep the unit dust-free and make it work a lot better at doing its job while, at the same time, filtering the dust out of the air you breathe all day. Because it is really easy to do, this filter should really be simply replaced or cleaned every so often depending on how much you use it.
Some clues to watch for in a bad primary air filter
- If you place a light source behind it, the light will barely break through to the other side of the filter
- Professionals have recommended to replace the filter about every three months to keep the air fresh for the family
- The system air filter looks dirty and it would be a good idea to replace it right now
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