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 with Fingwerk!

STICK STAY POWER - 3M adhesive backing ensures a rock-solid hold even in extreme temps
ALL WEATHER WARRIOR - Rubber material stays flexible, blocking drafts, dust, noise, and cold
CUT TO YOUR COMMAND - Easily trim with scissors or knife for a custom fit every time
VERSATILE HOME UPGRADE - Ideal for doors, windows, cabinets, speakers, and more—upgrade your space instantly
SEAL EVERY GAP LIKE A PRO - 20 feet of D-shaped rubber fits gaps from 2.5 to 5.5 mm perfectly

Fingwerk’s 20-foot self-adhesive D-shaped rubber weather stripping offers a durable, flexible seal for door and window gaps between 2.5 and 5.5 mm. Featuring strong 3M adhesive backing, it installs easily and withstands extreme temperatures without cracking or freezing, effectively blocking drafts, dust, noise, and cold to enhance home insulation and energy efficiency.

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Manufacturer	Fingwerk
Item Weight	180 g
Product Dimensions	4.83 x 20.32 x 20.32 cm; 180 g
Item model number	FD20
Size	20Ft
Color	Black D-Shaped
Material	Rubber
Item thickness	0.23 Inches
Included components	3M adhesive tape
Batteries Required?	No

Fingwerk 20 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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