Anyone who has attempted to measure the pressure drop of a filter mounted in a filter grille will admit it’s a challenge. Some installations have a significant amount of return duct between the filter grille and the air handling equipment while others are mounted on a platform with no duct.
With all the variations, how can you accurately measure this pressure drop without going through a lot of trouble? The solution might be easier than you think. Let’s look at what you’ll need, common mistakes to avoid, and how to measure correctly.