I am ordering the Fantech FKD10XL inline blower with the LD10 silencer. It's my understanding that I also need a backdraft damper and clamps to mount the silencer to the blower. The hood will be made with the switches for lights and motor already mounted on it. Am I missing any parts (other than the actual ducting)? What brand and part numbers should I be ordering for the damper and clamps? How many clamps do I need? Thanks in advance!