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This image shows a local source capture hood which has been disabled by disconnecting the exhaust duct. |
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This image shows a section of disconnected duct (see arrows). The duct served a
local exhaust hood for a transfer point between conveyor belts. This makes this material
transfer operation an uncontrolled point source of silica containing dust. |
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This image shows an abandoned exhaust duct. Abandoned ducts may not even be capped. Abandoned
ducts may indicate uncontrolled emission sources, exhaust air under capacity and exhaust
system leakage problems. |
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