Features:

• 99.97% effective at removing particles as small as 0.3 microns
• Honeywell True HEPA filter
• Fits Model 13520

Editor Reviews:

Product Description:
Genuine HoneywellTrue HEPA filter. 99.97% effective at removing particles as small as 0.3 microns from the air that passes through the filter. Fits Model 13520. Overall particle reduction depends on many factors including the amount of air processed, the pollutant type and the pollutants' introduction rate into the environment.

Rating : - Amazon.com sends Honeywell brand filter
Some reviews have mentioned other sellers do not send Honeywell brand filters. I purchased the filter from Amazon.com which they did send the direct replacement. No fit issues, works great. Will replace again in 3 years.