OnlyCat Dimensions

1. Flap Opening Size

Clear Opening Dimensions (Pass-Through Area)

• Width: 142 mm
• Height: 120 mm
• Format: (W × H)

This represents the usable space available for passage.

2. Required Cutout Size (Door/Panel Opening)

Rectangular Cutout Dimensions

• Width: 167 mm
• Height: 172 mm
• Format: (W × H)

Circular Mount Compatibility

• Diameter Range (Ø): 212 – 260 mm

3. External Frame Dimensions

Overall External Size

• Width: 210 mm
• Height: 210 mm
• Format: (W × H)

This represents the total outer dimensions of the unit once installed.

4. Depth & Projection Measurements

• Internal Depth (Inside): 79 mm
• Tunnel / Cut-Through Depth: 70 mm

These measurements describe how the unit sits within and protrudes from the mounting surface.

Summary Table

Please read the following information in full before commencing any cutting:

We strongly recommend waiting until your OnlyCat device arrives before cutting, as the supplied fixing frame can be used as a precise, full-accuracy template. The physical template includes subtle curvature that is difficult to replicate accurately without the device itself.

If you would prefer to complete the cut-out in advance, you may follow the instructions below. Please note that these instructions have been simplified and do not include the exact curvature of the fixing frame. To account for this, the dimensions have been slightly increased so the device will still fit correctly.

When marking out your template, it is essential that it is perfectly level and not tilted in any direction. We recommend using a spirit level to ensure accuracy.

Many customers find it helpful to drill pilot holes in each corner of the cut-out to allow the jigsaw blade to pass through comfortably. Please ensure that all pilot holes are drilled outside of the marked template line.

During installation, if the flap does not fit on the first attempt, gently file the edges of the cut-out until the device slides in smoothly. Do not force the flap into place.

Updated on: 11/02/2026