Enabling processors to screen and transport material simultaneously, Model Blow Thru Sieve achieves throughputs up to 60,000 lb/hr by combining powder screening and positive pressure conveying. Eliminating double handling, it allows good product to pass through vibrating mesh screen while removing oversize contamination from powders during dilute phase pneumatic conveying. Sieve assembles and disassembles with single tool and is mounted on mobile stand for use at multiple locations.