Linear design. Smarter airflow.

A precision-extruded linear diffuser engineered to move air the way architecture should — quietly, evenly, and seamlessly concealed.

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Engineered to endure

One linear slot diffuser vent cover. Total airflow control

Architectural-grade aluminum. No chipping, no warping, no replacing.

Direct airflow anywhere with 180° adjustable ice-tong controllers.

Custom-sized to your duct. Fits perfectly, the first time.

Inside the build

Engineered, not stamped.

All metal. No plastic.

Three machined components — face, blades, frame — extruded from solid aluminum and assembled to a 1/16 inch tolerance. No flex, no rattle, no stamped sheet-metal shortcuts.

  • Face
  • Blades
  • Frame

Why Linus

Built for the spec, designed for the room.

  • Commercial-Grade Construction

    Extruded aluminum throughout — rated for high-traffic residential and commercial floor installs.

  • 180-Degree Airflow Control

    Adjustable blades direct the throw exactly where the room needs it, then hold position.

  • Clean Minimalist Finish

    A flush, low-profile face that reads as architecture, not hardware.

  • Spec-Ready Design

    1-4 slot linear diffuser configurations and custom sizing to fit the drawing, not the other way around.

Spec sheets, ready to submit.

View all spec sheets & guides

The fine print, up front

Specified with confidence.

  • Lab-tested for airflow pressure and noise (ASHRAE/ANSI 70-2023 compliant)

  • Made in North America

  • Next-day stock to 3-day custom lead times

In your space

The vent you stop noticing.

Drag to compare a builder-grade vent cover with a Linus ProAir linear diffuser in the same room.

Linus ProAir Linus ProAir
Builder-grade Builder-grade

Builder-grade vents stick out. Linear diffuser vents blend in.

Seen in place

At home in residential. At scale in commercial.

  • Linus ProAir linear vent cover installed low on a hallway wall in a residential home
    Residential
  • Linus ProAir linear slot diffusers installed in the ceiling bulkhead of a retail interior
    Commercial

Find your Linus ProAir

Two options to specify.

Made to Fit

Cut to your opening, down to the 1/16 inch.

Odd vent opening? Send the dimensions. We extrude, machine, and finish linear vents to your exact spec.

Custom lengths, slot counts, and finishes with the same aluminum and same tolerance. Ships in as little as 3 days.

Start a custom order

From the field

Specified, installed, approved.

We needed a custom diffuser to complete our project in a hurry. Vent Covers Unlimited made it happen and our client couldn't be happier.

Sean D.

My clients are so happy with the look and how easy they perform. I have bought these 6 times for different commercial projects and will be coming back for more.

Jim S.

Specify Linus ProAir.

Linear design. Smarter airflow. In stock or made to spec.

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