Is the 12lb weight limit strict or just a suggestion?

The weight is a guide for you to gauge the size of your cat. There is no weight limit restriction. The weight is an indicator on whether your cat would be too big or not to fit through.

I have a hollow door I want to install this in. Will the liner prevent me from seeing inside of the hollow space of the door?

Yes, the liner has a frame of its own that will 'close-off' the hollow opening of the door. Be careful, though when tightening the two halves of the cat door together that you do not put too much pressure on the door facing and collapse the door; you may even want to insert 2x2 sections into the hollow-core door opening to give it interior support.

Can I put this cat door in a basement casement window that opens by sliding sideways?

I have used these doors for literally 20 years. Whenever they go in windows, they get mounted first onto a board to fit the window opening, whatever it may be. So hopefully you have someone, and/or the tools, to cut a board, cut a square hole through the board, mount the door with four screws and stick it in the window. I have always finished the board with paint before mounting. I have usually used only the 'active' side (with the red control knob) because the boards are generally 3/4" thick. They work great. Lock the sliding window in place with a stick/dowel/screw. Cats love the doors. So do we. Go figure.

What are its outside dimensions?

8.25"x 8". This is the second door that I've had, the first one was the exact same size but after 6 years the looks would start to slide and sometimes my dog would accidently lock herself out. I paid someone to install the first door but this time I installed it my self because it was exactly the same and door had already been cut to this size. It's perfect for my 7 pound Chihuahua.

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Ideal Pet Products Cat Flap Door, Small 6.25" x 6.25" Flap Size

Ideal Pet Products Cat Flap Door, Small 6.25" x 6.25" Flap Size

Product ID: 6110713

Details

Brand
Ideal Pet
Color
White
Material
Plastic
Mattress Thickness
1.75 inches
Size
Small (Pack of

📏Adjusts to 1.25"–1.75" door thickness

🔒4-way locking knob

🛡️Unbreakable LEXAN flap

S$63

Duties & taxes included

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Description

🐾 Unlock your cat’s freedom with style and security!

INDOOR OUTDOOR READY - Weather-resistant design fits any home layout, giving your pet freedom without compromise.
PERFECT SIZE FOR SMALL CATS - 6.25" x 6.25" flap designed for cats up to 12 pounds—comfort meets convenience.
SECURE 4 WAY LOCKING CONTROL - Keep your cat in, out, or both with effortless manual knob adjustment.
UNIVERSAL FIT TELESCOPING FRAME - Easily adapts to doors from 1.25" to 1.75" thick for seamless installation.
DURABLE TRANSPARENT LEXAN™ FLAP - Unbreakable and crystal clear for maximum visibility and safety.

The Ideal Pet Products Cat Flap Door features a tough, transparent LEXAN flap measuring 6.25" x 6.25", equipped with a versatile 4-way locking knob for customizable pet access control. Its telescoping frame fits door thicknesses from 1.25" to 1.75", making it perfect for both interior and exterior use. Designed for cats up to 12 pounds, this durable and easy-to-install cat door combines safety, convenience, and sleek functionality.

Specifications

ASIN	B0002805SM
Best Sellers Rank	#26,684 in Pet Supplies ( See Top 100 in Pet Supplies ) #45 in Cat Doors
Brand Name	Ideal Pet Products
Closure Type	Locking Flap
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (2,946)
Dog Breed Size	Small
Frame Material	Plastic
Global Trade Identification Number	00030559560007
Included Components	..
Item Type Name	Ideal Pet Products Cat Flap Door with 4 Way Lock, 6.25" x 6.25" Flap Size, white (SPF) .
Item Weight	8 ounces
Manufacturer	Ideal Pet Products
Manufacturer Part Number	SPF
Manufacturer Warranty Description	This product has a one year warranty from the date of the purchase of the product to be free of manufacturer’s defects in workmanship and materials. This express one year warranty is non-transferable and is limited only to the products sold by authorized sellers to the original purchaser of the product. Satisfactory proof of purchase must be provided to the manufacturer for this one year warranty …
Material Type	Plastic
Maximum Compatible Thickness	1.75 inches
Minimum Compatible Thickness	1.25 inches
Model Number	SPF
Number of Items	1
Pet Type	Cat
Size	Small (Pack of 1)
Target Audience	Cats
UPC	030559560007
Unit Count	1 Count
Weight Capacity Maximum	12 pounds

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