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Custom AC Window Vent Kit for Casement Windows

Custom AC Window Vent Kit for Casement Windows

Casement window vents for portable ac units are precision CNC machined out of durable 1/4" acrylic to your exact window. Air conditioner vents for crank out casement windows come with a quick detach hose adapter to make hose hookup a breeze. Just specify your hose size and type when ordering.

Measuring Reference Guide


A durable and elegant solution for venting out a casement window. A clear window insert is perfect for venting a portable air conditioner, laser cutter / laser engraver, grow tent, basement venting, clothes dryers, and any other application that requires venting out the window.

How to Install

The acrylic panel is typically held in place with double-sided adhesive or strips of Velcro. Generic window screen clips can also be used with certain window types.

Adhesive tape

Shipping & Delivery

See top red banner for current lead times (shipping is FREE for most U.S. orders)

We ship to Canada! (Ground is usually free. Priority is $54)

Our Return Policy

Custom Window Inserts have a 50% refund policy.

All non custom items are eligible for a 100% refund. Fill out our form on our Contact page to start an order return.

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Measuring & Options

  • Hose Sizes

    To determine your hose size, measure the outside diameter of your hose.

  • Hose Types

    There are two main hose types: aluminum ducting style hoses (general exhaust venting), and more rigid pvc style hoses (use for portable air conditioners).

  • Vent Types

    Every window insert comes with our standard vent which allows for easy hookup but does not offer protection from the outside elements. Our premium vent offers premium protection from the outside elements by featuring self closing louvers and a bug screen to keep out the critters.

  • Hole Placement

    Unless specified otherwise by the customer, we will place vent holes 3" from each edge.

  • Measure Casement Window

    Inserts for casement windows are made to the same size as your window screen. Screens are often bowed and out of square so please measure each end of your frame to get a consistent reading. Measurements are taken from outside edge to outside edge of the screen frame.

Measuring and Installation

Recent Customer Testimonials

  • Janelle T.

    I love how classy it makes it look. Better than a piece of wood that molds over time.

  • Kevin M.

    There is NO smell now, even with both lasers running, didn’t think I’d ever be able to say that.

  • Cynthia F.

    We received the inserts and wanted to let you know that everything from their construction to the packaging was absolutely flawless!

Made with Care

Martinson Manufacturing is a home-based family business in West Bend, Wisconsin whose mission is to create meticulous exhaust venting solutions to eliminate headaches and simplify people's lives.

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