What's the difference between a return air grille and a supply register?

 A return air grille pulls room air back into the system and has fixed blades with no damper. A supply register pushes conditioned air out and adds an adjustable damper to control airflow. If air is being drawn in, you want a return grille; if air is blowing out, you want a supply register.

How do I measure for a return air grille?

Measure the duct opening — the hole in the wall, floor, or ceiling — not the old grille's outer face. Order that duct opening size. The grille's outer dimensions will be larger so the frame overlaps the opening and covers the gap. Ordering by the outer size is the most common reason a grille shows up too small.

What size return grille does my system need?

Bigger return openings move air more quietly. As a rule of thumb, a larger free-area grille lowers air noise and strain, so when two sizes both fit the opening, the larger one usually runs quieter. If you're matching an existing return, order the same duct opening size you measured.

Should I choose steel or aluminum?

Steel is rigid, powder-coated, and the value choice for most walls and ceilings. Aluminum is lighter and naturally corrosion-resistant, which suits high-humidity rooms. Both are in stock across the same size range.

Do you offer contractor or bulk pricing?

Yes. Tiered bulk pricing is shown on every product and applies automatically as quantity rises — no quote request or phone call. Orders placed by 11AM ET ship the same day from US stock.