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Principles of Screening and Sizing Figure is multiplied by the sq.footage of the screen deck.• Calculation gives the basic capacity of each deck and the total capacity of the vibrating screen.• The vibrating screen capacity is determined: • Using a standard sizing formula (9 variables).• Basic capacity of each deck opening.• Unique factors of that application.• SWECO,manufacturer of industrial screens and sifting. 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Choosing the Right Screed Concrete Construction Magazine Vibrating handheld screeds work best on concrete with 5 inch or higher slump and on jobs that don’t require extreme flatness.Fred Murphy,of Buffalo,N.Y. based Murphy Brothers,says his company uses Magic Screeds for small jobs,but that “the result is only as good as the rakers on the job.The vibrating screeds smooth out the surface.