No drywall/sheetrock --> did I screw up?

Hi all,
I am adding an addition to my home. To extend the radiant heat system, I just finished making a 'remote' manifold that is about 25' away from the existing infrastructure. Its mounted in the garage, and inside a frame that I planned to cover with vapor barrier and 5/8" sheetrock, essentially firewalling it up. However, I do have two low-power zone valves in the space, and I have the feeling I needed to put sheetrock behind the manifold, to meet fire code. Is that right, or am I most likely ok?

http://picasaweb.google.com/lh/photo/utFIYllJs5xUP9mPrhbWTQ?feat=directlink

It appears you have more in there than just the two electric valves. You probably have to install a fire rated access panel in front of it to provide access to the "stuff" in there.

I use these guys for my access panels. I like the way they make really big ones, which is great for plumbing.

http://www.accessdoorsdirect.com/