• Fits horizontal sliding windows from 32" to 62-1/2", accommodating various home styles.
  • Features clear safety glass and weather-resistant flaps to maintain comfortable indoor temperatures year-round.
  • Quick setup with a spring-loaded mechanism that requires no permanent modifications—ideal for both renters and homeowners.
  • Available in robust aluminum or vinyl with a sturdy locking cover for enhanced security.
  • Offered in both standard and custom sizes with a choice of frame colors to match your home decor.

Liberty Cat Door for Horizontal Sliding Windows

Tool-Free Spring-Loaded Fit For Sliding Windows

Regular price $585.00

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Color: Black
Frame Type
Height Adjustment Range


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Featuring a tool-free spring-loaded setup that slides directly into horizontal window tracks, this insulating insert pairs safety glass with a flexible magnetic flap to give your cat instant freedom without damaging your home.

  • Fits horizontal sliding windows from 32" to 62-1/2", accommodating various home styles.
  • Features clear safety glass and weather-resistant flaps to maintain comfortable indoor temperatures year-round.
  • Quick setup with a spring-loaded mechanism that requires no permanent modifications—ideal for both renters and homeowners.
  • Available in robust aluminum or vinyl with a sturdy locking cover for enhanced security.
  • Offered in both standard and custom sizes with a choice of frame colors to match your home decor.

Installation & Fit

  • Fits standard horizontal sliding window track heights measuring 32" to 62-1/2" tall with up to 3-1/2" of spring-loaded height adjustment for a draft-free seal.
  • Requires horizontal sliding window tracks measuring at least 1" wide for aluminum frames or 1-1/2" wide for vinyl frames.
  • Constructed with heavy-duty extruded aluminum or vinyl framing and single-pane safety glass to preserve thermal insulation.
  • Includes a slide-in locking cover to secure the opening and regulate pet access.
  • Tool-free DIY installation slides directly into existing window tracks in under 5 minutes with zero drilling or permanent modifications.

Best Suited For

Ideal for:

  • Renters and homeowners seeking a fast, tool-free installation that slides into place with zero drilling or permanent modifications.
  • Cats and small, timid pets who benefit from a lightweight flexible flap and gentle magnetic seal for effortless access.
  • Window tracks made of aluminum (at least 1" wide) or vinyl (at least 1-1/2" wide).

Questions

What prevents cold air from entering through the pet door?

The door is designed with robust magnetic closures and weatherstripping to prevent drafts, creating an efficient barrier against cold air.

Does this work with aluminum, vinyl or wood window frames?

The insert is normally held in place by the track your window slides in, so the track dimensions matter more than what the frame is made of. Aluminum, vinyl and wood frames can all work provided the channel is the right size.

Wood frames are the exception worth planning for. Many older wood windows have no track at all, just a flat opening, which means the insert has nothing to seat into. In that case the pet door frame needs to be secured mechanically so it cannot be pushed out or fall inward, usually by fitting brackets or a wood stop against the frame on both sides. It is a straightforward addition, but it is extra work, so tell us if your window is wood and untracked before you order.

One more thing to keep in mind: vinyl and wood move more with temperature than aluminum does, so a snug measurement taken on a cold day can read differently in summer. Measure at a moderate temperature where you can, and tell us the frame material when you send dimensions.

What do the Step Over Range dimensions mean?

The step over is the part of the panel under the actual door opening. Depending on the flap size purchased, the stepover can range from 3"-7". This means that you can adjust it to any stepover within that range. So if you have a puppy, you can keep adjusting it as he/she grows.

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Product Details

Product Details


The Liberty Cat Door for Horizontal Sliding Windows offers a non-permanent, weather-tight pet entrance designed specifically for horizontal sliding window tracks. Crafted with single-pane safety glass and durable frame materials, it gives your cat complete freedom without compromising home insulation or security.

Adjustable Fit for Horizontal Windows
Engineered to fit sliding window openings from 32" to 62-1/2" wide, this insert features spring-loaded height adjustment options for a draft-free seal. The semi-permanent design allows effortless tool-free installation and removal, making it ideal for renters and homeowners alike.

Energy-Efficient Safety Glass
Constructed with durable single-pane safety glass and weather-sealed flaps, the panel preserves natural sunlight while insulating your home against seasonal weather and outdoor drafts.

Aluminum & Vinyl Frame Options
Choose between heavy-duty extruded aluminum or flexible vinyl frames to match your existing window style. Aluminum frames require window tracks at least 1" wide, while vinyl frames fit tracks at least 1-1/2" wide.

Integrated Security Cover
Includes a sturdy locking cover that slides into place over the flap, giving you total control over pet access and keeping your cat safely indoors when needed.

Size icon Sizing & Fit

Size Chart

Flap Dimensions:

7"w x 8"h

The entry way your dog goes through.

Overall Panel Width

10 3/16"

How wide your panel is.

Flap dimensions
Panel width
Step over height

Step-Over Height

3" - 5"

The distance from the bottom of the panel to the bottom of your flap.

Flap Size Flap Dimension Step Over Range Outside Frame Dimension Recommended Pet Height
Cat Flap 7"w x 8"h 3" - 5" 10 3/16" 9" - 13"

Do not know which size to get? Here is a measurement guide to help you out.

Aluminum panel has 1" framing, measure your track width to make sure that your window will accommodate the panel.

If your measured track height does not fall within one of the ranges above, we can make a custom height. Custom height option may take up to 4 weeks to special order the glass and build the panel. If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution.

FAQs

FAQ

Reviews

Customer Reviews

Request Freight Quote

Track heights exceeding 106 inches (107" or higher) may require additional shipping charges. Please provide your contact information for a custom freight quote, and our team will follow up during normal business hours.