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Preseason orders will begin to ship April 1st
Preseason orders will begin to ship April 1st

Custom Portable AC Sliding Window Vent Kit for Windows & Doors

Custom Portable AC Sliding Window Vent Kit for Windows & Doors

Sliding windows do not utilize the same window screen replacement method as hinged windows. See the video under the main product image to see how it works.

Vent your portable AC through sliding windows without blocking the opening or relying on temporary panels. This custom portable AC sliding window vent kit is precision-cut from durable ¼" acrylic and sized to your exact window or sliding door opening.

Each insert creates a sealed exhaust path so hot air vents outside instead of leaking back into the room. The quick-attach snap-fit collar locks securely into the panel, making hose connection simple while keeping the installation clean and stable.

Our sliding window vent panel for portable AC units are designed for both windows and sliding doors and install using a non-permanent mounting kit that can be set up in minutes.

Standard inserts are available in 12" widths, with larger custom sizes available when needed.

Build Your Custom Insert
How to Use

A durable and elegant solution for venting through horizontal sliding windows and sliding doors. This portable AC window insert for sliding windows creates a proper seal for portable air conditioners, laser cutters, grow tents, dryers, and any equipment requiring window exhaust, without gaps or hot air leaks.

Product Details

Custom cut to your exact window measurements for a perfect fit. Precision CNC machined from durable ¼" clear acrylic that won't warp or crack. Quick-attach snap-fit collar creates a secure, airtight seal around your exhaust hose.

Built for Sliding Windows. Sealed for Real Cooling.

Generic portable AC window kits don't seal properly in sliding windows, leaving gaps that let hot air leak back inside. When your portable AC hose window gap isn't sealed, your unit works harder and cools less effectively.

This custom portable AC window insert for sliding windows is built specifically for horizontal sliders and sliding glass doors, creating a dedicated exhaust path that vents hot air outside while completely sealing the opening.

You're not forcing your window to fit a generic kit. The insert is made to fit your window.

  • Custom CNC-cut ¼″ acrylic window vent panel sized to your exact opening

  • Quick-attach snap-fit collar for secure, airtight hose connection

  • Non-permanent portable AC sliding window installation in 5–10 minutes

  • Eliminates portable AC vent leaking hot air back into your space
Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Finally, a Vent Kit That Actually Fits Your Window

A precision-engineered venting solution designed to seal your sliding window opening properly, allowing your portable AC to exhaust hot air outside while preventing leaks that reduce cooling performance and waste energy.
Stops Hot Air Leaks

Stops Hot Air Leaks

Generic accordion kits gap and buckle. This creates an airtight seal so your AC cools the room, not the outdoors.

Built for Your Exact Window

Built for Your Exact Window

Measured and CNC-cut to your specifications. No makeshift solutions or stuffing gaps.

Install Without Tools

Install Without Tools

Slides into place and locks secure in under 10 minutes. Remove it anytime without damage.

Fits Sliding Glass Doors Too

Fits Sliding Glass Doors Too

Works on horizontal sliders and patio doors, anywhere you need proper AC exhaust.

See-Through Design

See-Through Design

¼" clear acrylic maintains your view and natural light while venting.

Hose Stays Put

Hose Stays Put

Snap-fit collar holds your exhaust hose firmly in place. No duct tape required.

Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Turn Your Portable AC Into Real Cooling Power

A properly vented exhaust makes all the difference. This custom window insert gives your portable AC a dedicated exit for hot air, helping the unit cool faster and maintain a more comfortable room temperature.
Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Engineered for Sliding Windows. Built to Actually Seal.

Generic portable AC window kits aren't designed for sliding windows, they leave gaps at the edges where hot air leaks back in. This sliding window vent panel for portable AC creates a precision-fit exhaust path that seals the entire opening, so your AC vents outside while the rest of your window stays clear and functional.
Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Perfect Fit Guarantee

If your custom portable AC sliding window vent kit doesn't fit perfectly, we'll remake it – free of charge.

Even if you measured wrong.

Just email us what needs adjusting: "Make it ½ inch narrower." "Add an inch to the height." We'll CNC-cut a new insert and ship it next business day. No hassle. No shipping fees. No leaving you stuck with a panel that doesn't seal.

Step-by-step measuring videos walk you through it
Snap-fit collar works with any portable AC hose size
Every measurement reviewed by our team before cutting
Wrong fit? We remake it free. No questions asked.
Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

When the Vent Seals Right, Your AC Stops Fighting Itself

You can hear your portable AC running nonstop, but the room stays hot. The problem isn't your AC unit, it's the gap around your window vent leaking hot exhaust back inside.

Generic window kits flex, buckle, and leave openings at the edges. In sliding windows, those gaps turn your portable AC into an expensive fan that recirculates warm air.

A custom portable AC sliding window vent kit creates a rigid seal around the exhaust hose. Hot air vents outside. Cool air stays inside. Your AC cycles off like it's supposed to.

Proper seal. Actual cooling. No more running 24/7.

Build Your Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Frequently Asked Questions

We'll remake it for free. Even if the measuring mistake was yours, just email us and we'll cut a new panel and ship it next business day, no charge.

Yes. Each portable AC sliding window vent kit is custom-cut to your exact measurements, so it fits horizontal sliding windows and sliding glass doors of any size.

Yes. The snap-fit collar is designed to work with standard portable AC exhaust hoses. If your hose diameter is non-standard, let us know during ordering and we'll adjust the vent opening.

No tools required. The insert slides into your window track and locks in place in 5–10 minutes. It's completely non-permanent, remove it anytime and your window returns to normal.

Orders ship within 5–7 business days after we receive your measurements. Standard shipping is included. Expedited options are available at checkout if you need it sooner.

Sliding Windows Done Right

Generic portable AC kits don't seal sliding windows. This custom insert does.
★★★★★ 4.9/5 | 1,904
Martinson Manufacturing
Precision window inserts for sliding
windows and doors.
Call Today 262-340-1418
Build Sliding Window Insert
Trusted by thousands of homeowners who needed a real sliding window vent solution.

Martinson Manufacturing designs and produces precision window inserts for portable air conditioners. Built for non-standard windows, each insert is made to exact dimensions and engineered to fit cleanly, install easily, and perform reliably in real homes.

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Our Promise

Every insert we build is
designed to fit your window exactly, install cleanly, and work the way it should. If it doesn’t fit right, we’ll remake it. No workarounds, no damage, no guesswork, just a solution that performs reliably in your home. Every time.

Contact

Martinson Manufacturing
705 Schoenhaar Dr #101West Bend, WI 53090
262-340-1418
info@martinsonmanufacturing.com
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