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Facility Manager solves his employer's acid rain problem due to investigation and installation of appropriate acid gas filtration devices. Solution is easy to maintain.
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An electronic components manufacturer, a typical industrial park tenant, began receiving inquiries about their processes.
Could any of them cause the teeny white dots of corrosion appearing on cars in the parking lot?
Something is marring cars in the lot
Etched only a few hours each week; fully vented
FM identified acid etching process as generic possibility, but deemed it unlikely because etching took place only 2 – 4 hours each week -- AND the process had a dedicated ventilation system.
Acids are used to etch conductive pathways into printed circuit boards.
Examples include:hydrofluoric acid (HF)nitric acid (HNO3)hydrochloric acid (HCI)phosphoric acid (H3PO4)ferric chloride (FeCl2)
Visit our blog to learn more:Acid Gases in the Fabrication of Microelectronics http://bit.ly/13GLvox
Made important discovery
The etching station’s ventilation system was installed before the FM was hired. So he decided to research the system and document his findings. He found:• Fan-powered system• No filtration• Vented acid gas to the outdoors
Exterior roofof building
Interiorceiling ofbuilding
Etching stationEtching station
Exhaust hood
Ductwork
FanAirflow
direction
Trace amounts of acid gas produced by the etching station were escaping the system via the roof exhaust port.
Prevailing breezes picked up the acid gases and blew them over the parking lot.
Acid gasfumes
Etching stationEtching station
Exhaust hood
FanModel 400 Mounted Sentrywith Outlet Plenum
Acid Gas Carbon Filter
Acid GasCarbon Filtercaptures acid gas before it disperses
Exterior roofof building
Interiorceiling ofbuilding
Etching stationEtching station
Exhaust hood
Ductwork
Fan
Airflowdirection
Acid gasfumes
Filter easy to replace when saturated
Acid gasfumes
BEFORE AFTER
www.sentryair.com
Accommodates multiple filter media types to capture both fumes and particulates.
Brief video on chemisorption.
Model 400 Mounted Sentry with Plenum
Short videoexplains how carbon filters work.
