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

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

Product ID: 745685690

Details

Brand
Fingwerk
Colour
White D-shape
Material
Rubber
Number of Items
1
Product Dimensions
12.19L x 0.01W

📏12.6m length for full coverage

❄️Flexible rubber resists extreme temps

🛠️Self-adhesive for effortless install

Description

🚪 Seal the deal on comfort and style—don’t let your home miss out!

STICK STAY POWER - Super-strong 3M adhesive ensures a firm hold that won’t peel off—even under harsh weather conditions.
VERSATILE DURABLE - Ideal for doors, windows, cabinets, speakers, and more—flexible rubber won’t crack or freeze, lasting season after season.
WEATHERPROOF YOUR SPACE - Blocks wind, dust, noise, and cold, creating a cozy, quiet environment that your home deserves.
CUT TO FIT SNAP TO INSTALL - Easily trim with scissors or a utility knife for a perfect custom fit on any door or window frame.
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, white D-shaped rubber weatherstrip designed to insulate door and window frames by sealing gaps from 2.5 to 5.5mm. Featuring a strong self-adhesive backing, it offers easy installation and durable performance against wind, dust, noise, and temperature extremes, making it a versatile solution for energy efficiency and home comfort.

Specifications

ASIN	B0CDLBFJ25
Brand Name	Fingwerk
Colour	White D-shape
Customer Reviews	4.1 4.1 out of 5 stars (194)
Included Components	Bag
Item Dimensions L x W	12.19L x 0.01W Meters
Item Type Name	Portable
Manufacturer	Fingwerk
Manufacturer Part Number	FD40W
Material Type	Rubber
Model Number	FD40W
Number of Items	1

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