Bending slightly, stiff hairs form a flexible line along edges. Secured in metal or plastic grooves, they stand firm yet allow motion. Near where door frames touch surfaces, the strips remain fixed, keeping out particles and air leaks. In machinery, they guide parts that pass through gaps. Dangling above moving belts, they shield lower areas from falling bits. Light leaks disappear once the strips settle into place. Quietly, soft bristles weaken sound waves. Through the barrier, dust finds it hard to pass and machines remain guarded. Without effort from anyone, order shows up on its own. With airflow locked down, energy stays put. The importance of the strip brushes and twisted in wire brush is huge for many reasons.
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