What size/width slot is required for pushing the plastic edge into?

Not sure what width you are asking about. If you are talking about the channel it goes into it is pretty much standard size which is a groove you press the flange into. The only width/gap you need to make sure of is the door to the frame which is about 5/8. Close your door and measure the spacing. I used this to replace the original of 37 years old and it fit like a charm. Very satisfied, looks good and will stop any air leaks. Hope this helps.

The groove you press the flange into should be installed first, because regular doors do not have it, right?

Actually our door had a groove and we just replaced the old stripping that the cats had shredded. Easy and worked great

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🚪 Seal the deal on comfort and style!

STICK STAY POWER - Super-strong 3M adhesive ensures a firm hold that won’t peel off—even under harsh weather conditions.
WEATHERPROOF YOUR SPACE - Durable rubber won’t freeze, crack, or degrade, providing year-round protection against drafts, dust, and noise.
CUT TO FIT SNAP TO SEAL - Easily trim with scissors or a utility knife for a perfect custom fit on any door or window frame.
VERSATILE INSULATION SOLUTION - Ideal for doors, windows, furniture, speakers, and more—upgrade your entire home or office with one sleek strip.
SEAL EVERY GAP SAVE EVERY DEGREE - 12.6 meters of premium D-shape rubber seals gaps from 2.5 to 5.5mm, locking in comfort and cutting energy waste.

The Fingwerk Door Seal Strip is a 12.6-meter long, black D-shaped rubber weatherstrip with a 9mm width and 6mm thickness. Featuring a strong self-adhesive backing, it easily seals gaps between 2.5 to 5.5mm on doors and windows, preventing drafts, dust, noise, and energy loss. Its flexible, durable material withstands extreme temperatures without cracking or freezing, making it a versatile and reliable insulation upgrade for any home or office.

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Brand	Fingwerk
Material	Rubber
Colour	Black D-shape
Product Dimensions	9W Millimeters
Item Thickness	6 Millimetres
Recommended Uses For Product	Window,Door
Manufacturer	Fingwerk
Net Quantity	1.0 Count
ASIN	B09TRBV7G8

Fingwerk Door Seal Strip Rubber 12.6M Self Adhesive Back D Shape Door Seal Strip for Door Frame Insulation Large Gap Easy Cut to Size (Black)

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