Seems to be self explanatory until the vent dimension comes into play.
Yes, the nail fin is on the rear of the vent on the 1" depth.
Other depths can accommodate the flange to be placed on the back or anywhere in the middle of the side of the vent.
The depth and back flange location is determined by the type of install the wall requires.


Not the best video, but it will be replaced soon.
This video shows a 4" square vent with the back flange located on the back of the vent wall.

The side view of this 2" deep triangular louver shows good definition of the rear nail fin.
It is built onto the trim to prevent leaks.
Common uses are fasten the vent to the wall sheeting and apply flashing tape sealing the vent to the wall.
Fasteners can go right through the flange into the wall since this fin will be covered.
Brick will usually require a 4" depth, whereas siding usually uses a 1" deep.
Stucco depth is based on the stucco style being applied.
Rock and stone walls also vary in depth and this is why we offer so many options.

Example: Stronger vents are deeper vents when they are of a larger size.
The strongest would be the 6" deep, yet it is too deep for brick.
Only 3.5" of the vent can protrude outside the gable wall.
On the order form, choose "3 1/2" from front and 2" from back" to place the flange for brick setting.
Now, the 6" (5 1/2" actual) vent will have 2 inches of vent inside the attic wall opening.


This 32 x 32 x 2 Octagon Vent was trimmed in a brick mold style.

36 x 24 x 4 Cathedral Vent with the nail fin set at 2" from front and 1 1/2" from front.
The back 1 1/2" of the vent are hidden by the nail fin.

This is also true for the Decor Vents with a back flange.

The install page for the back flange also has a tip for installing the vent from inside the attic safer.

Still have unanswered questions?
Call, text or email us for a personalized answer.

901.281.2887  [email protected]





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