Air filter assembly for filtering air with particulate matter

An air filter assembly comprising:

• (a) a housing including an air inlet, an air outlet, a wall separating said housing into a filtering chamber and a clean air chamber;
• said spacer wall including an air flow aperture therein;
• (b) a filter construction positioned in air flow communication with said air flow aperture, in said spacer wall;
• said filter construction including an extension of filter media defining a filter construction inner clean air chamber;
• (i) said filter construction being oriented with said filter inner clean air chamber in air flow communication with said spacer wall air flow aperture;
• (ii) said extension of filter media defining a longitudinal length along the filter construction;
• (c) a Venturi element mounted in said spacer wall air flow aperture and positioned to project into said filter construction inner clean air chamber;
• said Venturi element including an inlet portion and a throat portion;
• (d) a pulse-jet cleaning system including a blowpipe oriented to direct a pulse of air into said Venturi element from said clean air chamber and toward said filter construction, said blowpipe spaced a distance of greater than 20.6 inches from a base line of said Venturi element;
• (i) said blowpipe and said Venturi element being constructed and arranged to provide a positive cleaning pressure differential along greater than 75 percent of the length of said extension of filter media.