Ideal "Cat Sash" Cat Doors for Sash Windows

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  • Sash window cat door for tracks at least 7/8" wide
  • Available in two sizes to accommodate all cats
  • Features a 4-way locking system for more control over your pet's access
  • Tool-free installation
  • Comes in white only

The Ideal Cat Sash Cat Door for Sash Windows is an economical solution for giving your kitties access to and from the house without your constant assistance. Not only does this give you and your cat more freedom, but it also reduces energy loss and prevents bugs from entering. You'll no longer have to keep a door/window open to accommodate them. This cat door window insert from Ideal Pet Doors comes in two sizes to ensure that cats of all sizes can use it.


  • Fits into sash window tracks at least 7/8" wide
  • Features a 4-way locking mechanism: in only, out only & completely locked or unlocked
  • Extruded aluminum frame & clear, polycarbonate flap
  • Designed for temperate, three-season climates
  • The spring-loaded design does not require any tools for installation
  • Comes in regular and large sizes
  • Generic adjustment range fits windows 33 - 38" wide
  • Custom adjustment ranges are final sale with no returns


  • White framing matches common window designs
  • The sturdy flap is ideal for moderate weather resistance
  • Cats can access the yard freely
  • Easy, spring-loaded installation avoids making any permanent alterations in your home
  • A 4-way lock allows you to have more control over your cat's access to and from the sash window
  • You no longer have to let your cats in and out repeatedly

Size Chart

Flap SizeFlap DimensionHeight to Raise Window
Cat Flap6 1⁄4" w x 6 1⁄4" h11 7⁄8"
Large Cat Flap7 1⁄2" w x 10 1⁄2" h16 1⁄4"


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

Adjustment Ranges

  • 23" – 28" Custom
  • 27" – 32" Custom
  • 33" – 38"
  • 37" – 42" Custom
  • 45" – 50" Custom

Custom Sizes:  Adjustment ranges other than 33" – 38" are considered custom and a final sale; no return.

Cat door is centered (from inside looking out). Left and right positioning are extra-cost and custom, no returns. Must call for availability and to place order over the phone.  Centered is the only option for 23" – 28" adjustment range. 

Additional Information



Frame Material

Extruded Aluminum

Flap Material


Flap Colors


Flap Thickness


Dual or Single Pane

Single Pane 1/8" Thick

Warranty Period

1 year

Return Period

30 days

Flap Type

Single Flap

Your Maximum Pet Size

Cats, Large Cats

Climate Suitability

Temperate-3 Season

Type of Window

Sash (Up & Down)

Flap Design

Single, Rigid, Thin Flap

Ability to Lock Flap

Deluxe (4-way lock)

Can Be Installed In

Sash Windows

Sealing Value


Wind Resistance


Replacement Flaps Available


Insulation Value



How to Measure Your Sash Window for a Pet Door

The Ideal "Cat Sash" Installation


Where do I measure to select the correct adjustment range on the window mounted cat flap door?

Measure from the deepest part inside the track on the left all the way over inside the deepest part of the track on the right.

What is the min height to raise window?

This is how high you have to be able to open the window up in order to be able to get the sash into the track.

Does this ideal sash door have good insulating value?

They are ok and really best for more moderate climates.

Can I take it out if I need?

Yep! They are meant to be able to take in and out easily without the use of any tools.

How wide does my track have to be?

We recommend that you have a track that is at least 1" in order for the Ideal cat window door to fit properly.

If the sash is a little too wide what can I do?

Ideal made the sash so that you can trim about 1" off either side just in case there was a small measuring error.

If the sash isn't wide enough what can I do?

There are channels in both sides of the spring loaded adjustment ranges. You can trim a piece of wood and slide it into the channel to act as an extension.

What does "Custom" mean?

This means that the option(s) you have chosen make the sash non-returnable so there will be no returns or refunds and it is a final sale.

Does this only come in white?

Yes, they no longer offer color choices.

What is the Pet Flap Installation Position?

You can choose where the pet door is installed. So from the inside looking out whether the door is on the left side or the right.

What Cat Window Doors do you recommend for a Sash Window that has a built in lock?

We like the Ideal Cat Sash Cat Doors for Sash Windows.

Do you have an Ideal cat window door for hefty cats?

Yes, you will want to choose the larger size 7.5"w x 10.5"h. You will need to be able to raise your window at least 16.25" for the unit to fit the height.

Can my dog use this cat door for horizontal sliding windows?

Generally, cat flap pet doors are made to fit cats only. However, if you have a small dog, they may be able to fit through any cat doors for windows if it is in the largest size. Otherwise, we suggest buying a separate dog door for your dog.

Can I install this into my screen door?

This cat flap is made for sash windows only, and will not fit into any exterior doors. Check out the pet screen door from Petsafe, or shop from our list of the best cat doors.

Is the flap made from lexan?

No, the flap is polycarbonate.



The new and revised warranty that follows this disclaimer supersedes any and all previous warranties of whatever nature or description, whether express, implied or set by law. Any unexpired warranties shall now be governed by the terms of the new warranty for the duration of the existing warranty’s unexpired term.

One Year Warranty:

Ideal’s pet doors are very durable and with the proper care will provide many years of service for you and your pet. Thank you for selecting Ideal for your pet door. However, please be aware the pet doors are not waterproof against inclement weather or any excessive water exposure. The one year warranty set forth below applies to Ideal’s pet door(s).

This product has a One Year Warranty from the date of the purchase of the product to be free of manufacturer’s defects in workmanship and materials. This express One Year Warranty is limited only to the original purchaser of the product and is non-transferable. Satisfactory proof of purchase must be provided to the manufacturer for this one year warranty to apply. In that case, the manufacturer will replace at no charge to the purchaser the defective part(s). No refunds will be provided to the purchaser. No service contract is being provided under this One Year Warranty. Proof of purchase so that the One Year Warranty may be honored must be made to:

Ideal Pet Products, Inc.

24735 Avenue Rockefeller

Valencia, California, USA 91355

Attention: Warranty Department

(661) 294-2266 / 1-877-IDEALPET (433-2573)

Any and all implied warranties are expressly disclaimed and of no force or effect. These warranties include, but are not limited to, the implied warranties of merchantability, implied fitness for any intended purpose, and any warranties under the California Song-Beverly Consumer Act.

This One Year Warranty is void if the damage is due to improper installation, intentional misuse or abuse, repairs by anyone other than the manufacturer, the failure to follow manufacturer’s instructions, or if the product is being used for commercial purposes. Purchaser assumes all risks and liabilities for the misuse or abuse of the product, the commercial use of the product, or the failure to follow the manufacturer’s instructions.

This One Year Warranty only applies if the product is used for domesticated animals. The Manufacturer, Ideal, is not responsible and shall not have any liability for any damage to or defects caused by acts of God, criminal activity, dog abuse including, but not limited to chewing on the door, lightening, abuse, alteration, trespassing, children’s use of the product, unauthorized access, entry by non-domesticated or “stray” animals, or any other unintended use or misuse of the product.

The Manufacturer, Ideal, disclaims and excludes any liability for incidental, consequential, punitive, general, special, or other damages arising out of or connected with the purchase, use, or misuse of the product or concerning any warranty herein.

This One Year Warranty shall be governed by the laws of the State of California, USA. Venue shall be with the Los Angeles Superior Court, North Valley District.


This product, or any of its accessories, parts, or attachments may not prevent adults, children, animals, insects, or objects from passing through or using the opening created by the product.

Ideal Pet Products will not be liable for any unintended or accidental usage, misuse, abuse, criminal conduct, water intrusion, acts of god, damages or injuries occurring or accruing from the use of this product except in strict accordance with Ideal's One Year Warranty accompanying the sale of this product to the original purchaser.

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