MrZoot420
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Black Orchid Acoustic In Line Duct Mounted Silent Box Extractor Fan | eBay
Acoustica-box features a 2 or 4 pole motor (size dependent) that is equipped with ball bearings for a longer service life. The centrifugal impeller with forward curved blades is dynamically balanced to ensure high airflow levels against resistances caused by long duct runs and carbon filters.
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