Poorly, cheaply painted registers and grilles tend to stick, flake, rust, and rattle. That's why TRUaire's unique SmoothGlide process is to powder coat each and every handle, damper blade, linkage, face, and frame.
Powder coating is a far superior option of less expensive methods.
100% powder coat coverage dramatically reduces the rick of rust and keeps the dampers smooth to operate. No chipping or flaking paint means the rivet tension holds steady. Every single piece of every single register.
Quite simple the best Residential and Commercial Grilles, Registers, Diffusers truaire.com/