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 smart, live cozy — don’t let gaps steal your comfort!

MULTI PURPOSE SHIELD - Blocks wind, dust, noise, and cold while protecting door frames and reducing wear.
CUT TO FIT YOUR SPACE - Customizable with scissors or cutters for a perfect, tailored seal every time.
STICK SEAL IN MINUTES - Strong self-adhesive backing ensures a secure, long-lasting hold without messy tools.
WEATHERPROOF RESILIENT - Flexible rubber material stays intact without cracking or freezing, even in extreme temperatures.
SEAL EVERY GAP LIKE A PRO - 40 feet of premium D-shaped rubber strip covers large door and window gaps effortlessly.

This 40-foot black D-shaped rubber weatherstrip from Fingwerk offers a versatile, easy-to-install solution for sealing door and window gaps between 2.5 to 5.5mm. Its self-adhesive backing guarantees a firm hold, while the flexible, weather-resistant material prevents drafts, dust, noise, and temperature loss, enhancing home comfort and energy efficiency.

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