Does the HEPA Have a Front and Back Side?

It does! So do take note when you are attaching the filter to the purifier. The side that feels smoother is the side where dirty air enters. On this side, there are a lot of fluffy hairs used to capture the pollutant particles. The rougher side is where clean air blows out. The side to be installed is indicated on the Smart Air filters so just follow what is said. If it isn’t installed correctly, it will affect the effectiveness of the purifier.

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