These are 3 HEPA air filters I would recommend based on both my experience and reviews.  Both HomeLabs and Pure Enrichment air filters work well and are generally meant to be used in a normal bedroom sized area, while the IQAir is generally more effective at cleaning the air and is also meant for a larger room than the other two. 

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*In an effort to be fully transparent, these links are Amazon affiliate links and if you purchase a product by using any of these links SD Mold Inspection will earn a small commission. There are, of course, many different air filters you can find on amazon that would also work very well. These just happen to be the 3 that I have experience with.