Return Air Basement
 

I am working on finishing my basement and I am going to put two return air vents in. This is a picture of where I had hoped to put one of them, though in this area as you can see in the picture it runs up through the floor. How do I get this past code with fire blocking.

https://sites.google.com/site/imagelink45/IMG_3994.JPG
https://sites.google.com/site/imagelink45/IMG_4000.JPG

Thanks

Fire rated caulking around penetration may work.