Ideal "Fast Fit" Cat Door for Sliding Glass Doors

Regular price
Sale price
Regular price
Sold out
Unit price

  • Cost-effective patio cat door
  • Tool-free installation
  • Installs in aluminum sliding door tracks at least 7/8" wide
  • Suitable for cats of all sizes
  • 4-way locking system included
  • 7-10 day delay in shipping after you receive your tracking number

This Ideal Fast Fit sliding door cat door panel comes pre-installed with a cat door for sliding door. The removable, single-pane panel door insert installs without any permanent changes, which is especially convenient for rentals and vacation homes. Featuring a 4-way locking system, you get to control whether you want the cat door to be completely locked or unlocked, in-only or out-only. This patio door cat flap is an economical and effective way to ensure that your kitties can come and go as they please without letting in any unwanted critters.


  • Installs in aluminum sliding door tracks at least 7/8" wide
  • Available in three adjustable track height ranges:
    • 75" - 77 3/4"
    • 77 5/8" - 80 5/16"
    • 93 3/4" - 96 1/2"
  • Available in regular and large sizes to accommodate cats of all sizes
  • Clear, unbreakable polycarbonate flap
  • 4-way locking system
  • Designed for temperate, three-season climates
  • Energy-efficient weatherstripping and draft stopper included
  • Pin lock provided to lock the sliding glass door. If you do not want to do any drilling, you can purchase a Charley Bar.



  • Tool-free installation
  • Can install without permanent changes, especially great for rentals and vacation homes
  • Clear flaps are easy to use
  • Ideal cat door for sliding glass doors look sleek in the door


The Large Ideal Fast Fit Sliding Glass Cat Door is also known as the "ChubbyKat Large Cat Door."

Size Chart

Flap SizeFlap DimensionStepOverOverallWidthRecommendedPet Height*
Cat Flap6 1⁄4" w x 6 1⁄4" h4"10"8"
Large Cat Flap7 1⁄2" w x 10 1⁄2" h4"12"12" – 13 1⁄4"


The recommended pet width is generally 1 – 2" added to the width of the flap.

Still don't know which flap size to get? Here is a measurement guide to help you out.

Height Adjustment Ranges

  • B: Shorty 75" – 77 3⁄4" (additional cost)
  • C: Regular 77 5⁄8" – 80 3⁄8"
  • E: Tall 93 3⁄4" – 96 1⁄2" (additional cost)


Custom Height Add-On Extension is available: If your sliding glass door track is not accommodated by one of the stock adjustment  ranges, you can special order a height extension for either the Regular or Tall panels. Be sure to read the Details tab carefully to see how to compute how tall you'll want the custom height extension to be (maximum is 14").


CAUTION: If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution

Wondering how to measure your track? Review our Track Measuring Guide



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.

Additional Information

Frame Material

Extruded Aluminum

Track Width Minimum


Flap Material


Flap Colors


Flap Thickness


Dual or Single Pane

Single Pane 1/8" Thick

Warranty Period

1 year

Return Period

30 days

Your Maximum Pet Size

Cats, Large Cats, Small Dogs

Climate Suitability

Temperate-3 Season

House Locking Method

Pin Lock

Flap Design

Single, One Part, Rigid, Thin Flap

Can Be Installed In

Dual Pane Glass Sliding Glass Door, Single Pane Glass Sliding Glass Door

Custom Heights Available


High Aspect Ratio


Award Winning Design


Sealing Value


Wind Resistance


Insulation Value


Installation Instructions

Ideal Fast Fit Cat Door Installation

Step 1: Locate the knobs near the top of the panel. These will adjust your panel’s height.

Step 2: Release the spring-loaded top by turning the knobs counter-clockwise. The height adjustment panel should fully extend upward.

Step 3: Open your sliding glass/screen door.

Step 4: Insert the Fast Fit Cat Door with the knobs facing inside your home. Place the top of the panel into the top track of the sliding glass door first, then lift up the bottom of panel onto the ridge in the sliding glass door track.

Step 5: Slide your panel insert against the door jamb and make sure that the top is fully extended evenly, not tilted to one side.

Please Note: Check to make sure the bottom of the panel is sitting properly on the bottom track. Once you know that the panel fits properly in your track, place the weather stripping on the side of the panel that will meet your slider.

Step 6: Tighten the knobs by hand, turning clockwise to lock Fast Fit Cat Door in place. Your panel should now be securely placed in your track!

Please Note: To permanently install your panel, you can screw through the aluminum that protrudes on the existing frame of your door. Install two screws in the top and side by the bottom of the door. Do not put any screws into the frame by the glass, as this could break the glass.



How to Measure Your Sliding Glass Door for a Pet Door


How is this different than the regular Ideal Fast Fit?

The Ideal sliding glass cat flap door is smaller and rigid (like regular cat flaps), but the panel is the same. The Ideal Fast fit is a sliding glass pet door with a flexible flap.

Does this panel come in custom heights like the Custom Ideal Fast Fit?

No, but the pet patio door panel has an adjustable height that can fit into most tracks. If needed, you can order one size down from what you need height wise and get an Ideal Fast Fit height extension separately.

What material is the flap?

The cat door sliding door model has a rigid polycarbonate flap instead of flexible vinyl.

Does the cat door come in any larger sizes? 

If your cat cannot fit through the large cat flap, then we would suggest ordering a regular Ideal "Fast Fit" panel with larger flap openings.

How do I lock the cat door? 

There is a manual locking mechanism on the door that can be turned when you don't want the door in use. Since this is a manual flap, your cat does not need a collar key or microchip to use it.

How do I lock the panel to my sliding glass door? 

The door comes with a pin lock (that needs tools to be installed into your aluminum frame), or you can purchase a Charley Bar.

Is this panel suitable for extreme weather?

The ideal fast fit sliding cat door is best used in moderate climates.

Is the cat door flap clear? 

Yes, it is 100% clear.

Can we use the door for a small dog? 

We recommend the regular Ideal Fast Fit doggie door if you have an x-large dog. If you want a pet door that will work for both dogs and cats, we recommended the Petsafe Freedom Aluminum patio panel pet door, which has a magnetic closure at the bottom of its flexible flap.

What can I do if the 4" step over is too high for my cat? 

Unfortunately, the step over cannot be customized for this panel, but you can look into a wooden block step or a ramp to make it easier for your cat to get through.

Can I install it into my window?

No, this deluxe aluminum pet patio door panel is made for sliding doors only. You might be interested in the Thermo Sash 3e, a sash window pet door with Low-e glass.

Customer Reviews

Based on 11 reviews Write a review