Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 16 3/8"x21 1/2"x3/4")

Bought these for my in-laws as my mother in law has tons of breathing issues (COPD, asthma and allergies) they have a little furball who sheds and even though they clean they accumulate dust quickly. They were using a very low merv rated filter prior to this and I have noticed a difference in their indoor air quality since the switch. They just had a new unit installed and I want them to get the best bang for their buck and their health. Super easy to use - has arrows to show you which way for air flow, and they fit like a glove! Great value in comparison to the big box stores as well! This will also help increase efficiency as it’ll trap smaller particulates from going beyond the filter.

I have ordered these many times. They are quality filters and far less expensive than buying individually. Great customer service!!!

Fits perfectly , feels as good quality if not higher than the regular 3M brand that sells for twice the price.

Hard to find size filter at store at this price point .Great product .

6 pack 18x18x1 arrived well packed no damage. Quality product. Happy with purchase.