Thermo Sash Sure Flap pet door automatic doggie door
sureflap microchip cat door in thermo sash for sash windows
sure petcare microchip cat door front view

Thermo Sash 2e with SureFlap Microchip Cat Door

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  • Combines a highly insulating panel and technology of rfid cat doors
  • Fits sash windows from 22"-43" wide and tracks at least 1 thick
  • Prohibits unchipped animals from entering your home
  • Automatic cat doors sense from the outside only
  • Installation does not require any permanent alterations to the window

The SureFlap Thermo Sash 2e Microchip Cat Door for Windows is an innovative pet door panel that combines supreme insulation and reliable microchip sensing technology. The sensor scans your catšs embedded microchip and unlocks from the outside, ultimately preventing any unchipped animals from accessing your home. Not only will this window cat door keep your cats safe from unwelcome critters, it also ensures that they still have the freedom to come and go as they please.


  • Aluminum-framed panel is engineered with dual-pane glass to ensure thermal quality.
  • Fits sash windows from 22"-43" wide and tracks at least 1 thick.
  • 5 5/8"x 4 3/4" flap is a clear, rigid plastic line with brush weather stripping to prevent drafts.
  • SureFlap cat door programs up to 32 different microchips/RFID collar keys.
  • If your pet is not chipped or is waiting to be chipped, you can purchase an RFID collar key in lieu of the embedded microchip.
  • Any cat can exit the microchip cat door window insert, but only programmed cats can enter.
  • Battery-powered door uses 4 AA batteries that last around 6 months.
  • When batteries are low, an indicator light flashes every 5 seconds. Replace the batteries when this light is flashing. When the batteries die, the door defaults to the locked position, which could leave cats stuck outside.
  • Features a 4-way locking device (in or out only, or completely locked or unlocked) that will override the electronics when switched to the manual locking setting.
  • Available in white or dark bronze.
  • Inserting the panel does not require any drilling or permanent alterations. Installing the actual cat flap into the panel is required, as this does not ship pre-assembled.


  • Prevents strays, and other unwanted critters from accessing your home.
  • Ensures your cat's safety inside their own home.
  • Sash window cat door panel provides excellent energy efficiency and insulation.
  • Great solution for cats who do not enjoy wearing collars.
  • Cat door in windows mean you don't need to cut holes in your home.

Size Chart

Flap SizeFlap DimensionFrame HeightHeight to Raise WindowStock No 
Cat Flap5 3/4" w x 4 3/4" h11 1/2"12 1/2"07PPC20

Adjustment Ranges

  • 21 3/4" - 25" Custom Order

  • 24 3/4" - 28"

  • 27 3/4" - 31"

  • 30 3/4" - 34"

  • 33 3/4" - 37"

  • 36 3/4" - 40"

  • 39 3/4" - 43"

Pet door has 1" framing,  measure your track width to make sure that your window will accomate the sash.

The SureFlap Pet Door works with all identification microchips supplied by your vet and SureFlap RFID collar tags.

Final Sales   Adjustment Range 21 3/4" - 25" are final sales and cannot be returned. All Extra Large sizes are also custom and non-returnable.


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

Track width, Height you can raise the window, How wide the window is from left to right.


How to Measure Your Sash Window for a Pet Door


Patio Pacific Inc Pet Door Warranty

To the original purchaser, Patio Pacific Inc warrants this product and all of its component parts to be free of defects in materials or workmanship as follows:  Thermo Sash assemblies are warranted for a period of 15 years and the SurePet Microchip doors for a period of 3 years (assemblies employed in commercial kennels are warranted for a period of 3 years). 

Damage caused by accident, improper installation, abuse or normal wear, including damage by pets or glass breakage, is specifically excluded from this warranty. 

Defective materials returned to Patio Pacific Inc, together with proof of purchase, will be repaired or replaced and returned to the customer free of charge. 

Pet doors of other manufacturers installed in Patio Pacific products are covered by the warranty of the other manufacturer and not by Patio Pacific Inc.

Installation Instructions


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

Step 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.

Step 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.

Step 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.



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

Step 2: Find the 2 middle length screws in the SureFlap box.

Please Note: 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.

Step 3: The trim frame and screws will go on the outside 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 can 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.

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 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 magnet 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 flaps 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.

Additional Information

Frame Material


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

Controls Access

From Outside Only

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

Dual Pane Glass Sliding Glass Door

Additional Lock

4-Way Lock

Number Pets


Activated By

Implanted Chip, RFID

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