Stack Rain Shield : A device attached to the top of the stack to prevent rain from falling directly into the stack. It may also serve as a stack downdraft diverter. (Spec 12K)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}