Purificateur d'air

As important as the air cleaner size is how and where you mount it.
Try to mount at about 8-10 feet above the floor (no lower than 6' or 2/3 of the floor to ceiling distance if less than 8' ceiling).
Mount along the longest wall so the intake is approximately 1/3 the distance from the shorter wall. Mount no further than 4-6 inches from the wall.
The exhaust is the largest determiner of the circulation pattern. You are trying to encourage circulation parallel to the floor/ceiling. The exhaust is the clean air so that is what you want to position yourself in if you are looking for health benefits. If the dust has to pass your nose to get to the air cleaner, you get no benefits.