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 in Comfort, Seal Out the Chaos!

CUSTOM FIT FOR YOUR SPACE - Easily cut and bend to any shape, guaranteeing a seamless, professional finish every time.
BUILT TO BRAVE THE ELEMENTS - Durable rubber won’t crack or freeze, maintaining a cozy indoor climate year-round.
EFFORTLESS DIY INSTALLATION - Peel-and-stick adhesive ensures a firm hold without tools or hassle—stick it and forget it.
SEAL EVERY GAP WITH PRECISION - 40 feet of D-shape weather stripping fits gaps from 2.5 to 5.5 mm for flawless insulation.
VERSATILE PROTECTION BEYOND DOORS - Ideal for windows, cabinets, speakers, and more—upgrade your entire space’s energy efficiency.

The Fingwerk 40 Feet Rubber Weather Stripping Door Seal Strip offers a robust, flexible D-shaped design with self-adhesive backing for quick, tool-free installation. Measuring 40 feet long and 0.35 inches wide, it effectively seals gaps from 2.5 to 5.5 mm, preventing drafts, dust, noise, and temperature loss. Made from durable rubber and vinyl, it withstands extreme temperatures without cracking, making it perfect for doors, windows, and various household applications.

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Brand	Fingwerk
Material	Rubber, Vinyl
Color	Black
Product Dimensions	480"L x 0.35"W
Item Thickness	0.23 Inches
Recommended Uses For Product	Window,Door
Manufacturer	Fingwerk
Unit Count	40.0 Feet
Item Weight	13.4 ounces
Size	40 Ft
Item Package Quantity	1

40 Feet Rubber Weather Stripping Door Seal Strip, Self-Adhesive Backing D-Shape Door Weatherstripping for Door Frame Insulation Large Gap, Easy Cut to Size(Black)

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