I am documenting the build with pics and will post them all once I get it up and smoking.. I just have a question that I know can be answered by some of the experience on here.. I am working on a cold smoke mod (similar to the mailbox mod).. i will be using a dryer hose from the FB to the CC.. My question is what type of metal does my 90 degree attachment need to be made of?? I have seen some make of aluminum will that work?