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How to Install a Wall Venter in Drywall

Unlike floor registers these are fastened, which means the one thing that matters is what the screws are biting into.

Installing4 min read

A wall vent is a fifteen minute job with a screwdriver. The part worth slowing down for is what your screws are actually going into.

Duct collar or drywall

There are two situations behind that hole and they want different hardware.

In most homes the sheet metal duct runs right up to the back of the drywall and ends in a collar. Your screws bite into that metal, it holds well, and you are done.

Sometimes the duct stops short, or the opening was cut oversize, and there is nothing but cavity behind the drywall. A plain screw into drywall will feel tight for about a week and then spin. Use anchors. The vent weighs very little, so you do not need anything heavy duty, you just need the screw to grip something.

Snug, not tight

This is the most common way a wall vent ends up looking wrong. Drywall paper crushes easily. Drive the screws hard and you pull the faceplate into a shallow dish, which reads as a crooked vent even though the vent itself is fine.

Stop as soon as the faceplate meets the wall and the vent stops moving.

Louver direction actually matters

Supply vents throw air. The louvers are angled to push it out and across the room, not let it fall straight down the wall, and our wall vents use 18 louvers over three adjustable dampers to do it.

Fitted upside down, the air hugs the wall, you get a cold or hot stripe down the paint, and the room takes longer to come to temperature. Check the direction before you mark the holes, because nobody wants to redrill.

Supply or return?

Worth confirming before you buy. A supply vent blows air into the room and has dampers. A return grille pulls air back to the furnace and should never have a damper on it. They look similar and they are not interchangeable, so if you are unsure, read the ten second test.

Before you order

Measure the duct opening, not the cover you are replacing. Sizes name the hole. We stock five wall vent sizes from 10x4 up to 12x6, listed with prices on the wall vent page.

Step by step

  1. Take the old cover off

    Back out the screws and keep them until the new vent is up. If the old screws were biting into sheet metal duct and not drywall, you may want to reuse those exact holes.

  2. Look at what is behind the opening

    Reach in. If you feel sheet metal within an inch or so of the drywall face, the screws go into the duct collar and the job is simple. If there is nothing but a cavity, you are fastening into drywall alone and will want anchors.

  3. Measure the duct opening

    Width first. A 12x6 wall vent fits an 11.75in x 5.5in opening and covers it with a 13.75in x 7.75in faceplate, so there is roughly an inch of overlap on each side to hide the cut edge.

  4. Offer the vent up and mark

    Hold it in place and check the louvers are running the direction you want before you mark anything. Mark through the mounting holes with a pencil.

  5. Fasten, but do not crank it down

    Snug is enough. Overtightening into drywall crushes the paper face and the vent ends up sitting in a dish. If a screw spins without biting, back it out and put an anchor in.

  6. Set the dampers

    Our wall vents have three adjustable smooth-glide dampers behind the face. Open them fully to start, then use them to balance the room once the system has been running.

Common questions

Ideally the sheet metal duct collar sitting just behind the drywall. Where there is no collar within reach, use drywall anchors rated for a few pounds. The vent is light, but drywall alone holds a plain screw poorly and it will work loose.
Angled away from the nearest wall or ceiling so the air throws into the room instead of washing straight down the surface. On a high sidewall vent that usually means louvers angled downward.
Same vent, same hardware. The difference is that gravity is working against you while you line up the screws, so start one screw a couple of turns before offering up the other side.
Usually the drywall around the cut is bowed from overtightening, or there is a burr on the cut edge holding one corner off. Back the screws out, run a knife round the opening edge, and refasten snug snug, not tight.
No. Wall vents are not built to be walked on and they fasten with screws instead of dropping in. A floor opening needs a floor register.
No. The faceplate overlap covers the cut edge. Sealing the vent to the wall makes it harder to remove later and does nothing useful for airflow.

Written by Bryce Hardware. We manufacture the registers, vents, grilles and access panels described here, in 32 standard sizes. The dimensions and tolerances in this guide are the ones we publish on our own product specifications.

Spotted something wrong, or measured something that doesn't match? Tell us: support@brycehardware.com