📐 Dimensions & Compatibility

Everything about Flappie's measurements, compatible doors, walls, and glass, and how to check if Flappie fits your home and your cat.

All Dimensions at a Glance

Here are all the key measurements you need to know before installing Flappie. The standard frame accommodates doors and walls up to 36 mm thick. For thicker installations, tunnel extensions are available — each adds 27 mm, up to a maximum wall thickn

Will Flappie Fit? (Compatibility Check)

Not sure whether Flappie will work with your door, wall, or glass? We've built a quick configurator that walks you through the key questions — material, thickness, hole size — and tells you exactly what you need. → Start the Compatibility Check. It t

Installation in Glass

Flappie can be installed in glass doors and panels — this is actually the most common installation type. Here's what you need to know about hole sizes, adapters, and what to expect. The minimum hole diameter is Ø 212 mm. If your hole is between 215 a

Installation in a Door or Wall

Flappie can be installed in wooden doors, PVC doors, and walls. Here's what you need to know about cut-out sizes, materials, and thickness. For new installations, we recommend a cut-out of 166 mm (W) × 170 mm (H). An existing hole from a previous cat

Tunnel Extensions: When and How Many?

If your door or wall is thicker than 36 mm, you'll need tunnel extensions. They click into each other like building blocks and extend the depth of the Flappie frame so it reaches through your installation. Each frame lip is 46 mm deep. The standard F

Mounting Adapter: When Is It Needed?

The mounting adapter is a ring that sits between the Flappie frame and the glass, filling the gap when your hole is larger than the standard fit. It's only needed for glass installations. In short: if your glass hole is between 215 and 260 mm, you ne

Large Cats (Maine Coon & Co.)

Flappie's passage opening measures 150.5 × 126 mm (width × height). That's enough for most domestic cats — but if you have a particularly large breed, it's worth checking before you buy. The best way to find out is to measure your cat's shoulder widt

Replacing an Existing Cat Flap

Already have a cat flap and want to upgrade to Flappie? In many cases, your existing hole can be reused — depending on its size and shape. Flappie fits into circular glass holes between Ø 212 and 260 mm. Here's how common cat flap brands compare:. Qu