All roof vents are made out of G90 galvanized steel with a square opening.
When measuring, the dimensions below are inside dimensions.
70 degree : 8" , 12" , 15" , or 18"
90 degree : 15" or 18"​
Pivot Screen available in 15"
70 degree or 90 degree
SA-1270P - comes standard with a SA-1270 & SA-120751 fan
High Quality & Good Service