NAMSAN Cat Door Interior Door, White, Flap Opening 7.1" x 7.3", 4 Way Locking Cat Door for Exterior Door, Weatherproof Pet Door for Kitten Small Dogs, Cat Flap Doors for Wooden/Metal Door, Window Review
By Dr. Lena Ortiz · Canine wellness writer · Published 2026-05-14 · Updated 2026-07-09
The NAMSAN interior cat door is a budget friendly flap with 4 way locking and a large review base backing up its 4.6 star rating, a solid pick for a straightforward wooden or metal door install.
Owners who want an affordable interior or exterior cat flap for kittens or small dogs, and need to fit it into a wooden or metal door, or even a window.
Skip if
You have a larger dog that also needs to pass through, since the 7.1 x 7.3 inch flap opening is sized for cats and small pets.
Priced 52% below the category median ($31.95 across 49 tracked models)
Our scorecard
4.6/5overall
Owner rating4.6/5
4.6 average across 3,500 owner ratings
Popularity4.3/5
3,500 owner reviews, more 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
["The NAMSAN cat door is a white flap door with a 7.1 x 7.3 inch opening, priced at $15.41. It's built to install into a range of surfaces including wooden doors, metal doors, and windows, which gives it more placement flexibility than doors made for a single material.", 'A 4 way locking mechanism is the standout feature here, letting owners set the flap to in only, out only, both directions, or fully locked, useful for controlling when a cat or small dog can come and go. NAMSAN also markets it as weatherproof, aimed at keeping drafts and moisture out when the flap is closed.', 'With about 3,500 reviews and a 4.6 star average, this is one of the more heavily reviewed doors in its price range, suggesting a lot of owners have put it through everyday use without major complaints.']
Pros
Strong 4.6 star average across roughly 3,500 reviews
4 way locking gives control over in, out, both, or fully closed
Fits wooden doors, metal doors, and windows
Budget friendly price at $15.41
Weatherproof design for draft and moisture control
Cons
Flap opening is sized for kittens and small dogs, not larger pets
No bought last month figure listed to confirm recent demand
Detailed material and thickness specs are not provided
Performance notes
The 7.1 x 7.3 inch flap opening and 4 way locking mechanism are the core functional details available, with the weatherproof claim suggesting a sealed flap when locked closed.
What buyers say
A 4.6 star rating from about 3,500 reviews is a large and consistent sample, pointing to a well liked budget option among cat door shoppers.
It means the flap can be set to allow movement in only, out only, both directions, or locked shut entirely, giving owners control over when pets can pass through.
Can this be installed in a window?
Yes, NAMSAN lists this door as compatible with windows in addition to wooden and metal doors, though exact window mounting specs aren't detailed in the listing.
Is this door big enough for a dog?
The flap opening measures 7.1 x 7.3 inches, which is described as suited to kittens and small dogs rather than medium or large breeds.
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