• Designed to fit sash windows ranging from 22" to 44" in width, accommodating a variety of home styles and sizes.
  • Features clear safety glass for improved insulation, ensuring energy efficiency across severe 4-season climates.
  • Offers a simple, semi-permanent installation process, ideal for renters and those looking for a non-invasive solution.
  • Comes with a locking cover for security, constructed with a heavy extruded aluminum frame for long-lasting durability.
  • Available in multiple sizes and custom-made-to-order for windows outside the standard adjustment range, providing a tailored fit for any pet.

Liberty Pet Door for Black Sash Windows

Lightweight Flexible Flap For Smaller Pets

Regular price $642.00

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Size
Width Adjustment Range


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Built with a soft clear flap that requires minimal force to open, this insulating window insert gives timid cats and cautious pets gentle outdoor freedom without scary door resistance.

  • Designed to fit sash windows ranging from 22" to 44" in width, accommodating a variety of home styles and sizes.
  • Features clear safety glass for improved insulation, ensuring energy efficiency across severe 4-season climates.
  • Offers a simple, semi-permanent installation process, ideal for renters and those looking for a non-invasive solution.
  • Comes with a locking cover for security, constructed with a heavy extruded aluminum frame for long-lasting durability.
  • Available in multiple sizes and custom-made-to-order for windows outside the standard adjustment range, providing a tailored fit for any pet.

Installation & Fit

  • Fits vertical sash window openings measuring 22" to 44" wide with up to 3-1/2" of spring-loaded width adjustment for a draft-free seal.
  • Requires aluminum sash window tracks measuring at least 1" wide.
  • Constructed with heavy-duty extruded aluminum in a black finish and single-pane safety glass.
  • Includes a top-loading ABS locking cover to secure the opening and regulate pet access.
  • Tool-free DIY setup installs directly into existing window tracks in under 5 minutes with zero drilling or permanent modifications.

Best Suited For

Ideal for:

  • Black or dark-finished vertical sash windows measuring 22" to 44" wide with built-in spring adjustment.
  • Renters and homeowners seeking a fast, tool-free installation that slides into place with zero drilling or permanent modifications.
  • Everyday, year-round weather protection using single-pane safety glass and an adjustable magnetic closure.
  • Small pets to large dogs who benefit from a lightweight, flexible flap with adjustable magnetic tension.
  • Aluminum window tracks measuring at least 1" wide.

Not ideal for:

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.

Can you lock the pet door?

It comes with a closing cover, and you slide that in on the inside of the house. It is a very secure ABS plastic material that is as strong as a 16 gauge steel.

Does it lock?

We do include a c-clamp lock. It is not designed to mate with your existing sliding door lock. You can also use a Charley-Bar or dowel in the track.

Explore all questions
Product Details

Product Details


The Liberty Pet Door for Black Sash Windows provides a sleek, weather-tight pet opening designed specifically for vertical sash windows. Built with single-pane safety glass and a durable black aluminum frame, it offers effortless pet access while maintaining home insulation and security.

Sleek Black Aluminum Frame
Crafted with a heavy-duty extruded aluminum frame in a black finish, this panel seamlessly matches modern dark window frames while delivering long-lasting structural strength. Fits sash window tracks at least 1" wide.

Adjustable Sash Window Fit
Designed for window openings ranging from 22" to 44" wide, the panel features up to 3-1/2" of built-in spring-loaded height adjustment to ensure a tight, draft-free seal without requiring permanent modifications to your window frame.

Energy-Efficient Safety Glass
Outfitted with single-pane safety glass, the insert insulates your home against severe four-season weather extremes while preserving natural light and outdoor views.

All-Weather Magnetic Flap
The clear vinyl pet flap utilizes magnetic closure strips and weatherstripping to prevent wind gusts and cold drafts from entering your home. Magnetic tension can be adjusted to match your pet's mobility needs.

Top-Loading Security Cover
Includes a durable top-loading locking cover made from molded ABS plastic, allowing you to quickly secure the door and manage pet access as needed.

Sizing & Fit

Size Chart

Flap Dimensions:

5"w x 12"h

The entry way your dog goes through.

Small flap
Small frame
Small rough cut

Height To Raise Window:

18 1/2"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

7"w x 16"h

The entry way your dog goes through.

Medium flap
Medium frame
Medium rough cut

Height To Raise Window:

22 1/2"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

9"w x 20"h

The entry way your dog goes through.

Large flap
Large frame
Large rough cut

Height To Raise Window:

26 1/2"

How high you must raise your window in order to fit the panel into the track.

Flap Size Flap Dimension Outside Frame Dimension Recommended Pet Height
Small 5"w x 12"h 18 1/2" 9" - 15"
Medium 7"w x 16"h 22 1/2" 9" - 21"
Large 9"w x 20"h 26 1/2" 9" - 27"

 

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

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.