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PP: Perforated Plate
Perforated Plate (俗: 吼冚) 風咀格柵及散流器專用的隔板，是一種採用鍍鋅鋼板或鋁材製成（通常為黑色塗裝）的特製金屬擋板。分散氣流分佈及與黑冚一樣可遮蔽風管以保持視覺美觀。。標準的尺寸為1220(4尺)長一件，亦可根據要求生產不同長度。
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