Duct Size	A	B
6 inch	6-5/8"	3"
8 inch	6-5/8"	3"
10 inch	6-5/8"	3"
12 inch	6-5/8"	3"
14 inch	6-5/8"	3"
16 inch	6-5/8"	3"
18 inch	6-5/8"	3"
20 inch	6-5/8"	3"
24 inch	6-5/8"	3"

 

Measure your specific application, then refer to the chart to select the appropriate blast gate size.