Full Glass Cat Door for Window,22"-28.5" Adjustable Width,1-Min Install | 4 Locking Modes,Aluminum Frame,HD Glass,Magnetic Closure,Weatherproof Sliding Pet Door Window Insert for Cats Review
By Dr. Lena Ortiz · Canine wellness writer · Published 2026-05-28 · Updated 2026-06-28
The Klarana glass door is a window-insert option for anyone who cannot or does not want to cut a hole in a door, sliding into an existing window opening between 22 and 28.5 inches wide with a magnetic flap and 4 locking modes.
Cat owners who want a door-free installation, sliding this insert into a sliding window opening between 22 and 28.5 inches wide.
Skip if
Your window opening falls outside the 22 to 28.5 inch range, or you would rather have a permanent door-mounted flap.
Priced 96% above the category median ($31.95 across 49 tracked models)
Our scorecard
4.2/5overall
Owner rating4.4/5
4.4 average across 79 owner ratings
Popularity0.6/5
79 owner reviews, fewer than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog and cat food, health, gear and grooming we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
Rather than mounting into a door, this Klarana insert slides into an existing sliding window frame, adjusting to fit openings from 22 to 28.5 inches wide. That makes it a fit for renters or anyone who does not want to cut into a door, since the listing describes a roughly 1-minute install with no cutting involved.
The frame is aluminum with a glass panel and a magnetic flap closure, built for doors or window channels up to about 2.95 inches thick. It offers 4 separate locking modes, so you can leave it open both ways, restrict it to one direction, or lock it shut entirely, and it is described as weatherproof for use in an exterior-facing window.
At $62.69 it costs more than most flap-style door inserts, which tracks with the glass and aluminum build and the window-specific engineering.
Pros
No cutting or drilling, fits into an existing sliding window
Adjustable 22 to 28.5 inch width covers a range of window sizes
Aluminum frame with a glass panel for a cleaner look
4 locking modes for flexible access control
Weatherproof for use in a window opening
Cons
Higher price than door-mounted flap options
Only fits sliding windows within its width range
Smaller review base of 79 compared to established door brands
Performance notes
The insert uses an aluminum frame with a glass panel and a magnetic flap, adjusting from 22 to 28.5 inches wide to fit a range of sliding window openings up to about 2.95 inches thick, and it includes 4 locking modes for controlling when your cat can pass through.
What buyers say
A 4.4 rating from 79 reviews and about 100 recent purchases suggests owners are largely happy with it, though this is a lower-volume listing than the category's bigger sellers.
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