Thermo Sash 2e with SureFlap Microchip Pet Door

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  • Microchip door for sash windows
  • Made with dual-pane, Low-E glass for optimal insulation
  • Prevents raccoons, strays, and unwanted critters from entering your home
  • Flap size 7"wide x 7"high great for cats and small dogs 
  • Available in white or bronze
  • 1 RFID collar key included for unchipped pets

The Thermo Sash 2e with SureFlap Microchip Cat Door for Windows features a dual-pane, Low-E glass panel for sash windows that optimizes insulation and maintains high energy efficiency. Designed with the SureFlap cat door with microchip sensors, this is an innovative solution for preventing neighborhood cats or unwanted critters from accessing your home. The SureFlap microchip cat flap contains RFID technology, which senses your pet’s implanted microchip which provides selective entry and opens only for your pets upon scanning. Any animal that is not chipped and programmed to the door will be unable to enter the door, but any pet can go outside through the flap.

Looking for something else? Take a look at our full selection of microchip pet doors.


  • Thermo sash fits into sash windows 21 3/4" - 43" wide in 3" increments with tracks at least 1" thick.
  • Panel has a spring-loaded design for a tool-free and simply
  • Dual-pane glass and Low-E coating for optimal thermal quality
  • 7" x 7" flap accommodates cats of all sizes and small dogs.
  • Includes one RFID collar key in case your pet is not yet microchipped.
  • Draft stopper included to keep air from coming in between the two windows.
  • Flap programs up to 32 different microchips or RFID collar keys.
  • Battery operated.
  • Includes a 4-way locking system (in/out only or completely locked/unlocked) that overrides electronic functions when enabled.
  • Curfew mode allows you to set a time period in which your pets cannot use the door.

 Raccoon Mode:

Custom Mode 5 is the raccoon mode, making this door a raccoon-proof cat door. As soon as the sensors detect an animal’s head in the tunnel of the pet door, it scans to read the microchip. If the animal is not one whose chip has been programmed to trigger the door, the two locks on the exterior of the door are activated for added security. At this point, the unit will keep scanning for your pet's microchip, and the exterior locks will remain engaged until approximately 10 seconds after the intruder animal has moved away from the door. When the exterior locks are engaged it makes it impossible for the raccoon to open the door towards them in order to get in. The interior locks prevent the raccoon or other stray animals from pushing through the door into the house. The combination of the two sets of locks has proved impenetrable to raccoons in our product testing.


  • Spring-loaded design is removable and does not require any tools for installation.
  • Stops raccoons, neighborhood cats, and unwanted critters from using the cat door to get inside.
  • Microchip technology is great for pets that don't enjoy wearing collars.
  • Curfew mode lets you keep pets inside for a specific time period whenever necessary.
  • Even if a pet is outside when curfew mode is on and the door is locked, they can still get in with the microchip sensing but other critters can't.
  • Sturdy panel is sleek and modern.

Size Chart

Flap SizeFlap DimensionHeight To Raise Window
Small7" x 7"16"

Adjustment Ranges:

  • 22"-25" (custom, non-returnable final sale)
  • 25"-28"
  • 28"-31"
  • 31"-34"
  • 34"-37"
  • 37"-40"
  • 40"-43"

22"-25" adjustment range sales are final, no return. Please simulate the opening (open the window, use duct tape
to simulate the opening) to be sure this size is appropriate before ordering.

90 day return policy applies to adjustment ranges other than 22"-25"

If you would like to purchase this product with custom adjustment ranges, please call us at 1-800-826-2871 for more information. 

Pet door is compatible with all vet implanted microchips and SureFlap RFID collar tags.

Additional Information

Flap Dimension

7" w x 7" h

Frame Material


Flap Material


Flap Colors


Flap Thickness


Warranty Period

3 years

Return Period

90 days (except for custom height ranges)

Door Open Type

Unlocks for the key signal and pet pushes open

Your Maximum Pet Size

Cats, Large Cats, Small Dogs

Controls Access

From Outside Only

# Collar Keys Included


Operates On


Flap Opens

Pet Must Push

Type of Window

Sash (Up & Down)

Flap Design

Single, One Part, Rigid, Thin Flap

Can Be Installed In

Sash Windows

Additional Lock

4-Way Lock

Number Pets


Activated By

Implanted Chip, RFID, Ultra-Sonic

Installation Instructions

Installation Instructions for the Thermo Sash 2e with SureFlap Microchip Pet Door


1x Window pet door

1x Foam Weather Strip

1x Center Post Weather Seal Draft Stopper


1Loosen the thumb screws at the end of the sash. This allows the spring mechanism to move freely side to side.

2. Insert the sash into the window track. Push against the spring mechanism and swing the opposite end into the opposite window track. Gently release. Tighten the thumbscrews.

If the pet door sits properly, remove the pet door to put on the foam weather-stripping in step 3.

3. Apply the foam weather-stripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the panel, pressing to ensure it adheres. Install on both the top and the bottom. Trim to fit with scissors.

4. Mount the draft stopper vinyl weather strip. This strip prevents air leaking between the window frame when raised to accommodate the sash. Trim to fit with scissors.


For a permanent lock, install a wood screw in the track immediately above the window on both sides. You will no longer be able to raise the window.

For a temporary lock, place a removable wooden dowel or charley bar in either track above the window.


Remove the screws on the top and bottom closest to the edge of the pet door. Then slightly loosen the screws closest to the glass. Next, slide off the side piece, then the flap assembly. Rotate the flap assembly (essentially flipping it upside down) then slide it back in. Make sure the locking cover is on the same side as the thumb screws.Replace the end spacer and screws.


Make sure you place steps or ramps leading to your pet’s door at a height that works! When they go through the flap, the top of the flap should be at least 1” (2,5 cm) higher than the top of their back. Watch your pet and adjust as needed to keep them comfortable.



1x Panel

1x Foam Weather Strip

1x Center Post Weather Seal Draft Stopper

Separate Box:

1x Microchip pet/cat door

You will need to do a couple extra steps to install your SureFlap Microchip Pet Door, Cat Flap or DualScan through your panel. The SureFlap ships in a separate box, and before you open it you should first test to make sure your panel will work in your door or window. Follow steps 1 & 2 from the Panel Installation Instructions.

Remove your SureFlap from its box, and follow the directions included to program the pet door. You can then proceed with the instructions below!


Insert SureFlap Cat Flap into hole

Step 1:  After testing the panel to make sure it works in your window or door, and testing that the SureFlap will work with your pets, you are ready to attach the pet door to the hole in the panel!

Screw SureFlap Cat Door in place

2. Find the middle length screws in the SureFlap box. The Pet Door version uses 4 screws, while the Cat Flap and Dual Scan will only utilize 2 screws.

Thumbscrews should be on the same side as the controls of your SureFlap. Installing your SureFlap with the controls on the outside of your home will damage the pet door and void SureFlap’s warranty.

3. The trim frame and screws will go on the ouside of the panel. Place the side with the locking controls on the inside of the panel. The controls will need to be on the same side as the thumbscrews. You can then follow the remaining instructions for either the vertical or horizontal panels.


You might choose to secure your pet door in your track with screws. This can be done by drilling screws at an angle in the top and bottom tracks. We recommend doing this from the outside to minimize damage to the sliding glass door frame. One-way screws will prevent tampering or removal of the panel from the outside.  


Some stationary panels can be unfastened and moved over to one side so that you can install the pet door panel between the jamb and stationary panel. Avoid damaging your sliding glass door by checking that your door can move and that you can reinstall it properly before trying to uninstall the unit.

You will still lose space in your slider to move through, however you will be able to use your existing sliding door lock to secure your home. Installing your pet door this way is also great if you already have an alarm system in place. If your sliding glass door slides on the outside track, using an alternative lock might not be possible so this allows you to still lock your door.

For help with installation, replacement parts or other questions visit or call 805-781-7700 Monday-Friday 7am-4:30pm PT

Training Sessions 

Getting Started: Some pets will take longer than others to acclimate to their new door, so patience is key! Never push or shove your pet through the door (this will only develop negative feelings). Instead, follow these training tips + tricks to help introduce your pet to the door gradually.

Limit training sessions to no more than 10 minutes at a time. Two well spaced out sessions per day should be the maximum.

Hold the flap all the way open for your pet at first; then a little less each subsequent time so your pet learns to push through on their own. Stay consistent with verbal encouragement and treats for best results.

Teaching Your Cat to Use Their Door

Step One: Introduce your cat to the door by putting your hand through it so they know how it works. Have them inspect the new cat flap to get used to the look and smell (this is a great time to program your cat’s microchip!).  

Tip: You can wipe your cat’s face or body with a cloth and wipe the door with the same cloth to give it a more familiar scent. 

Step Two: Some electronic cat doors make a slight clicking noise when opening and closing which can scare timid cats. Try manually opening and shutting the flap slowly to familiarize your cat with this noise. 

Step Three: Get your kitty’s favorite treats or toy ready! Start by using a treat to encourage your cat through while holding the flap open for them. Once they are comfortable, start lowering the flap on them as they walk through for their treat.

Tip: Be sure to train your cat using the actual door height - meaning raise the door enough so it resembles how high it will be once installed.

Tip: If you have a door with non-removable magnets, putting some painter’s tape over the magnets can help decrease the magnet attraction strength temporarily for training purposes.

Step Four: Always make sure to reward your cat with praise (and maybe another treat) when they pass through the door.  Remember: training can take a considerable amount of time. There is no standard practice as every cat is unique.

Quick Tips

- For especially timid cats, temporarily tape it up out of the way while they get used to the idea of walking through the tunnel.

- Clear flaps may confuse pets as they might think the flap is a window. Try putting a piece of masking tape on the clear flap to distinguish it from a window and reinforce to your pet its use as a door.

- Magnetic and weighted flaps have additional weight which may be difficult for your pet to push through. Fix this problem by gently pushing the door to assist your pet as they go through or removing the magnetic closure until your pet gets used to the full weight of the door on their own.

- If you plan on installing more than one pet door, use the same flap if possible for consistency.

- Electronic cat flap doors make a small clicking noise when the flap is activated that may frighten timid pets. The best way to remedy this problem is to positively reinforce this sound in your pet’s mind.

- Praise your pet when they come near the door and hear the activation noise.

- If this does not work, disable the electronics with “training mode” and have your pet use the door manually for a week or so while getting acquainted with the door.

- Consistency is key! Stay consistent both in your training methods and your choice of pet doors. If you have multiple pets the first to learn will often demonstrate  for the others!

- When your first lock the flap shut, introduce your pet slowly rather than letting them “learn the hard way” by running into it.


How to Measure Your Sash Window for a Pet Door

Introducing the SureFlap Microchip Pet Door


What 3 things do I have to know/measure when choosing a pet door for sash window?

Track width, how high you can raise the window, and how wide the window is from left to right.

Will this keep certain pets inside while letting other out?

No, the SureFlap cat flap only controls who comes in and anything can get out. If you wanted one that controlled both ways, take a look at the sash here with the Dual Scan here.

How do I measure my track?

You want to measure how high you can raise your window, which needs be at least 16" high. Then measure how wide the track is from the far left to the far right side. The sash is 1" thick, so make sure your track is wide enough for the sash to fit into on the left, right, and bottom.

Will this work for my dog?

Since the flap is only 7" x 7" this door flap works best as a small dog door or a cat door.

How do I measure my pet?

You can check out our pet measurement guide, or you can cut a hole in a piece of cardboard that is 7" x 7" (same size as the flap opening) and see if they can get through. If not, we would advise that you go with a larger pet door.

Can this keep out raccoons?

Yes, it is very raccoon resistant because of the identification microchip and four-way locking mechanism functions but you would have to have Mode 5 enabled as stated in the instructions.

Is this only available in white?

You can also get the sash and door in bronze, which it a very dark brown that appears to be almost black.

Is it easy to install?

We made it so that the door was easier to install, take a look at the installation instructions and see if this is something you would be able to do on your own. For detailed instructions, see the "installation instructions" on this page.

Is it easy to program?

Compared to other doors the SureFlap Microchip Pet Door is more straightforward to program. Being one of the best cat doors, the instructions are very well written and easy to follow.

Would this work for more extreme weather areas?

Yes, the panel on this large cat door has dual pane Low-E glass, and since the flap locks, it stays shut, making it weather-resistant. You will not experience any wind blowing it in.

Can I lock the door?

Yes, you can lock the SureFlap cat door and it even has a timer function so you can lock it when you choose automatically instead of having to manual lock it.


Patio Pacific Warranty

Endura Flap products have a lifetime warranty against defects in materials and workmanship under standard regular use. Damage caused by not using the product as intended, improper installation, and chewing is not covered under this warranty.

SureFlap™ Cat Door Guarantee

Guarantee: SureFlap™ microchip cat flaps carry a 3-year guarantee from the date of purchase, subject to proof of purchase date. The guarantee is restricted to any fault caused by defective materials, components or manufacture. This guarantee does not apply to products whose defect has been caused by normal wear and tear, misuse, neglect or intentional damage.

In the event of a part failure due to faulty parts or workmanship, the part will be replaced free of charge during the guarantee period only. At the manufacturer's discretion, a replacement product may be provided free of charge in the case of a more serious malfunction. Your statutory rights are not affected.

Disclaimer: The SureFlap™ microchip cat flap incorporates selective entry features which have been designed to minimize the risk of unwanted animals entering your home. However, it is not possible to fully guarantee the exclusion of all other animals in all circumstances.

In the rare event of an unwanted animal gaining access to your home, SureFlap cannot accept liability for any damage or inconvenience which may be incurred.

Warning: The motorized catch and manual lock are provided exclusively to prevent the entry of unwanted animals and is not a security device. SureFlap Ltd cannot accept liability for unintended use and the owner of the product accepts full responsibility for supervising the access in and out of the home that it provides.

In households with children, it is essential to include the cat flap in child-proofing considerations. Misuse of the cat flap by a child may result in the child coming into contact with potential dangers. For this reason, young children should be monitored at all times when in the immediate vicinity of the cat flap.

Caution: Prior to installation, it is the responsibility of the user to consult all building codes which may influence the fitting of the cat flap and assess the suitability of a given installation. The user must also consider potential hazards present inside or outside the cat flap as well as the impact that subsequent modifications to your property may have on the existence and use of your cat flap. It is recommended that these assessments are conducted in consultation with a construction professional.

Do not install SureFlap™ in a fire door as it will render the fire door unfit for purpose.

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