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 savings!

STICK STAY POWER - Super-strong 3M adhesive ensures a firm hold that won’t peel off, even in harsh weather.
CUT TO YOUR COMMAND - Easily trim with scissors or a utility knife for a perfect custom fit every time.
WEATHERPROOF YOUR SPACE - Flexible, crack-resistant material blocks wind, dust, noise, and cold to keep your home cozy.
SEAL EVERY GAP LIKE A PRO - 40 feet of D-shaped rubber strip fits gaps from 2.5 to 5.5 mm for airtight insulation.
VERSATILE INSULATION SOLUTION - Ideal for doors, windows, cabinets, speakers, and more—upgrade your entire space effortlessly.

The Fingwerk 40 Feet Rubber Weather Stripping Door Seal Strip offers a durable, flexible D-shaped design with a strong self-adhesive backing. Measuring 40 feet long and 0.35 inches wide, it fits gaps from 2.5 to 5.5 mm, providing effective insulation against drafts, dust, noise, and temperature extremes. Easy to cut and install, it’s a versatile solution for enhancing energy efficiency and protecting your home year-round.

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Brand	Fingwerk
Material	Rubber, Vinyl
Color	Black D-Shaped
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	40Ft
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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