Where it goes, how it installs, what size it is, how much air it moves and what it’s made of. Five quick questions and you’ll know exactly what you need.
Five things decide which vent cover you need: where it goes, how it installs, its size, how much air it needs to move and what it’s made of. Here’s what each one means.
Walls and ceilings usually share the same opening sizes and mounting, so most wall vents also work overhead. Floors are different: vents underfoot have to carry weight, so use a floor-rated vent there. Exhaust fans in bathrooms and kitchens take their own covers, sized to the fan rather than a duct.
This is about how the cover meets the surface.
| Flush | Framed (surface-mount) | |
|---|---|---|
| Look | Sits level with the surface for a seamless, built-in look | A slim edge sits on the surface and covers the opening |
| Install | Set in during drywall or flooring work; pro install recommended | Drops into the existing opening; DIY friendly |
| Best for | New builds and renovations | Quick upgrades and rentals |
“Vent” is the everyday word for any duct cover. A register has a built-in damper that opens and closes to control airflow. A grille has no damper and usually covers a return air opening. A diffuser spreads air in several directions and is most common on ceilings.
Supply openings push heated or cooled air into the room and usually take a register, so you can adjust the flow. Return openings pull air back to the system; they’re often larger and covered with a grille. Closing too many supply registers can throw off your system’s balance, so adjust them a little at a time.
A cover’s design changes how much air gets through, measured as its free area, the open part of its face. Higher-airflow designs can help in rooms that run hot, cold or stuffy, and at the end of long duct runs. Every room’s needs are different, so confirm the airflow yours requires with your contractor or on our airflow specs page.
Powder-coated steel is the most durable choice and holds its finish for years. ABS plastic is lightweight, budget-friendly and won’t rust, which suits rentals and quick updates. Decorative options like cast iron, brass and wood are mostly about style.
Know your style but not your size? Use the size guide to measure your opening in two steps.
Vent is the everyday word for any cover over a duct opening. A register has a built-in damper you can open or close to control airflow. A grille has no damper and is usually used on return air openings. A diffuser spreads air in several directions and is most common on ceilings.
Choose flush if you want the cover level with the surface for a built-in look and you are renovating or building, since it is installed during drywall or flooring work. Choose framed if you want to upgrade an existing opening yourself, since a framed cover drops into the hole and its slim edge covers the gap.
Usually, yes. Wall and ceiling openings use the same sizes and similar mounting, so most wall vents work overhead too. Floors are the exception: vents underfoot need to carry weight, so use a floor-rated vent there.
Yes. How much air gets through depends on the cover’s free area, the open portion of its face. Higher-airflow designs can help in rooms that run hot, cold or stuffy, or at the end of a long duct run. Confirm the airflow your room requires with your contractor.
Measure the duct opening, not the old cover, short side first. Round each side to the nearest standard inch. The size guide walks through it step by step.