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Ideal Flexible Sash Window Insert

$110.99 - $232.99
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Ideal Flexible Flap Window Pet Doors

Single Pane Glass - Single Flap

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The Ideal Pet Flexible Flap Window Inserts are designed for both cats and dogs. All models are available only in white. These inserts have an approximate 5 inch adjustment range, allowing for the possibility of moving the unit from one window to another, as long as your window widths fall within the same given range. These units are designed to be inserted into the track that your window glides up and down in.

Make sure your channel or track is a t least 1" wide to accept this unit.

The sash window closes down to the unit, providing the stability. There are no locking mechanisms that come with these units, however, most customer will use a brace-bar or stick above the top window so that it cannot be opened.

Flexible vinyl flap with magnetic seal at base
Slide in plastic locking cover for pet opening
Both ends have spring loaded adjustment
Pet Opening is centered in unit
Safety tempered glass on either side

Views showing Locking Panel Cover with Pet Opening

Note: When selecting an adjustment range, make sure your overall width measurement falls comfortably within the selected range. The unit must contract more than your opening width to get the unit into the channel. Your channel width should be 1" wide to accept this unit. Call us if you would like assistance with your measurements or selection.

A Pet Ramp may also be something you are considering due to the fact that some windows are too high up for you pet to access comfortably and without danger. In these situations we recommend a pet ramp, we carry an excellent selection of ramps to fit nearly any situation and they come in many different shapes, sizes and colors.

How to
Replace Flaps
Need Flaps?

Ideal Flexible Flap
Window Pet Doors

This window unit has 2 adjustment pieces, one on each end
giving you the maximum fitting potential between different windows

flexible flap pet door used in the sash window insert
The pet door flap in these units has a metal strip along the bottom that aligns with magnets in frame. A locking slide in closing panel included. The pet door frame & Locking panel color will match selected panel color.
The adjustment ranges are the minimum & maximum that a unit will contract. Make sure you allow for the depth of your window channel when selecting a range. Call us for assistance: 608-781-7385
Pet Opening
Flap Size
Unit Height
Ranges Offered
5 x 7"
12 1/2"
(Starts at)
7 x 11 1/4"
16 9/16"
(Starts at)
10 1/2 x 15"
20 5/16"
33" -38"
Super Large
15 x 20"
45" -50"
*The small & medium size openings are the only models that is available in the 23-28" range
All Ideal Products returns incur a 20% restocking fee
Technical Specifications
All Window Sash Units have a spring-load adjuster on EACH end
Info below highlights only one end of unit

Flexible Flap Sash Window Pet Door Technical Information
Replacement Flaps

Click for More Info & Pricing
Single Pane - Single Flap
Cats & Dogs
Basic Utility Model
$137.99 - $232.99
3 Star Rated Pet Door

Ideal Pet Products Authorized Retailer

Pricing starts at: $137.99
Complete pricing chart at bottom of this page
All Ideal Pet Product returns incur a 20% restocking fee

Sash Window Pet Door

Sash Window Pet Door Installation Instructions

  • Raise your sash window pane. Hold Secure.

  • Foam Bumper Seal is included. Cut 2 pieces of bumper seal to the same length as the width of your window. Peel off protective backing and attach foam along top and bottom edge of pet door.

  • Place the pet door assembly between the window sill and the open window.

  • Lower the window pane until it touches down onto the pet door assembly.

  • Turn the silver knobs counter-clockwise one turn to release the end spacers.

  • Pet door assembly should now fit the window snugly on both ends.

  • Turn silver knobs clockwise to lock ends in position.

  • Vinyl Draft Stopper extrusion is included. Cut to required length. Clean window surface and peel off protective backing. Attach along top edge of the lower window. Make sure inside flexible edge touches glass.

***If knobs interfere with bottom sill, you may remove knobs as follows:

  • Take out 2 screws that hold adjustable end extrusions.

  • Push steel rods into long bottom extrusions about 1/8 inch below surface. Locking knob and pin will then pull out.

  • Re-assemble adjustable end extrusions.

    Note: Leave top knobs in place to lock your pet door in position.

Fits Openings From 23" to 50"
Single Pane Glass | Single Flexible Flap Door
Slide In Blocking Panel - Utility Rated - Four Pet Opening Sizes