The VAV's we have are 120V with a 30 or 50VA transformer to run the damper motor. We plan on putting 5 - 10 on a circuit to save $$'s. The fuse is desired to avoid a single failure from shutting down the whole circuit. Code required a means of disconnect for servicing.

On this project, none have strip heat.

Yes we know these small transformers are generally self limiting, but this is a hospital and the owner wants to play it safe.

They are available at 24V but voltage drop is a killer.