Plastic quarter window

[Ron Earp]

Your missing part of his quote in your post...

I agree with David that you can put it where ever you choose but you cannot remove something that isn't allowed to be removed. So, Ron if you put your window back in then your duct is perfectly legal. (It looks like from that picture that the window was removed which I do not see an allowance for in the IT ruleset.)

Stephen

We are allowed to install brake ducts. But in that allowance, there isn't a section that says we can use a hose clamp. But of course, we all use hose clamps to install the ducts because it says we can duct the brakes for cooling.

Here, I can install a NACA duct and it can be 100 square inches in size. If the NACA duct I choose is 100 square inches it might be larger than the window and might require the window be cut away to install it, e.g., gone.

Or, if that interpretation isn't favored, what if I cut away all about 1/4" of the window and glue a 95 sq inch NACA duct in place. Would that be more satisfactory?