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Archive Notice - OSHA Archive

NOTICE: This is an OSHA Archive Document, and no longer represents OSHA Policy. It is presented here as historical content, for research and review purposes only.

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This image shows a "fishtail" transition conveying exhaust air from a hood. This image shows a "fishtail" transition conveying exhaust air from a hood. The exhaust duct is disconnected at a flanged connection point.

Small leaks in exhaust ducts compromise the efficacy of individual hoods and many such small leaks can compromise the entire exhaust system.
   
This image shows a disconnected duct exhausting a screen. This image shows a disconnected duct exhausting a screen.
   
This image shows an erosion hole in an exhaust duct that provides local source capture of particulate. This image shows an erosion hole in an exhaust duct that provides local source capture of particulate.

Ducts should be inspected regularly for defects, and all defects should be promptly repaired.
   
This image indicates where return belt rollers have acted as belt scrapers and process materials have unintentionally collected underneath the conveyor belt. This image indicates where return belt rollers have acted as belt scrapers and process materials have unintentionally collected underneath the conveyor belt.

If upstream conveyor belt scrapers were adjusted properly, these dust piles would not exist.
   
This image shows process materials unintentionally collecting underneath a cage mill and its conveyor belt. This image shows process materials unintentionally collecting underneath a cage mill and its conveyor belt.

If local source capture hoods for the mill and belt were working properly, these dust piles would not exist.
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