Registers have louvers built into them, forming a single unit. You can use the louvers to regulate the amount and flow of air or heat passing through them.
Grilles are open work structures without louvers.
They can be used alone, or to regulate air flow in conjunction with a louver assembly. Below is a list of our frequently asked questions. Please click on the one that interests you or scroll through them all. 16 - Mike, you sure do some surprising things with registers and grilles, and I wish you and the family all the best for another successful catalog. In recent years an increasing percentage of our sales has been to folks who are restoring older homes.