This anti-microbial treated, MERV 7, 90 day, no blow-by filter by Best Living Systems is the best replacement filter on the market today. There is no cardboard frame to warp or become a food source for mold and bacteria, no blow-by allowing air to go untreated and unfiltered, and no replacement for three months or more in clean environments. The unique design of the BLS PerfectFit provides an internal frame sandwiched between two layers of anti-microbial treated MERV 7 media allowing free airflow that will not strain your air purifier. Plus it has side-to-side flush edges to insure that all the air is filtered and treated. This filter keeps your air purifier cleaner and reduces the possibility of mold and mildew growth.

Features:

• MERV 7 ASHRAE rated standard
• NORMI approved anti-microbial treatment
• Internal frame eliminates paper cardboard
• Edge-to-edge design for PerfectFit
• Disposable every 90 days
• Easy to install, fits every time

Benefits:

• Provides adequate airflow with minimal restriction
• Eliminates bio-nesting of micro-organisms
• Eliminates blow-by so all the air is filtered
• Sturdy internal frame eliminates warping