Every Tri-Pleat filter operates on the strainer principle of filtration, utilizing specially designed radial pleats, shaped and spaced on pre-determined centers. This controlled spacing promotes diffusion of air pressures over the entire pleated surface. The least resistance is initially in the bottom of the pleat, where contaminants are filtered out. As contaminants build up and the filter becomes loaded, resistance at the bottom of the pleat increases and air flow gradually moves up the side walls of the pleat, ensuring usage of all available media.
Because of velocity and inertial forces, larger contaminants in the air stream are unable to change direction as the air flow moves up the sidewalls of the pleat and lodge in the bottom of the pleat, while finer microscopic particles are trapped on the sidewalls.
Increased media loft (created by particulate build up) is achieved as dirty air angles through the pleat sides. The result is increased efficiency.
