Continuous Air screens have an inlet tube attached to a blower operating full time. Top of the line frames will stand rigid and not flex in the wind, and blower back pressure allows for small leaks in seams or seals without diminishing firmness. Tolerance for leaks is inescapably related to materials, construction and (therefore) price.
Sealed Air movie screens are inflated just before they are needed, then disconnected from the blower. Additional inflation is required if the air pumped inside cools relative to air temperature outside the unit. Sealed air screens operate silently, but lower-quality units sag and distort when small leaks develop in seams and seals.