The brass grill in these photos is 12 x 8 x 2.1 cm.
http://easthope.ca/BrassVent0.png
http://easthope.ca/BrassVent2.png
Please explain how it should be installed. Should it be on a deck or on a bulkhead? Where is it typically located and oriented?
Is there a net accessible photo of something similar and installed properly?
Thanks, ... Peter E.