This is a package of 4 filters. These filters function at MERV 11 and are 4.5 in thick.
For this thickness of filter we recommend changing your filter every 6-9 months for maximum air flow, best filtration, and least wear and tear on your system.
Something to note is that human lungs filter air at approximately MERV 8 equivilant. Using filters above MERV 8 helps to take the strain off your respiratory system. For people with multiple pets, allergies, COPD or other respiratory issues a minimum of MERV 11 is strongly recommended.
A total of 3 guests made comments
Henry Allen - 2024-03-03
Super fast delivery and the quality of the product is beyond my expectations. Excellent value and the customer service is really supportive.