Kerf-in leaf / flap Weatherstrip Profile

What this profile class means

Profile family: Compression seal
Profile subtype: Kerf-in leaf / flap
Common application context: door, window
Contact mode: compression or wiping contact
Seal body: leaf / flap
Mounting interface: kerf / inserted base

Thin flexible leaf/flap projects from an inserted base rather than forming a closed bulb.

Common terminology that may lead to this class includes: kerf leaf seal, kerf flap seal, wiper leaf. These terms are discovery clues only; they do not prove fit.

Identification order

1. Confirm the installed location and motion: casement/awning/sliding/hinged frame seals.
2. Identify the mounting/receiver interface before judging the outer body shape.
3. Inspect an end-view cross-section and note orientation, mirrored/asymmetric features, fibres, chambers, leaves/flaps, carriers, or fasteners as applicable.
4. Measure the critical fields below using the the measurement datum and tool-resolution rules and preserve uncertainty.
5. Compare only against records with compatible interface geometry. Treat visual similarity as a clue, not as compatibility evidence.
6. Keep product identity and replacement fit as separate claims under this evidence policy.

What to measure

• base width — capture as an observed/measured field; do not invent a value.
• leaf length/reach — capture as an observed/measured field; do not invent a value.
• leaf thickness if documented — capture as an observed/measured field; do not invent a value.
• orientation — capture as an observed/measured field; do not invent a value.

Also record the measurement tool, resolution, repeated readings where practical, sample condition, original reported value/unit, and measurement notes. If a critical field cannot be measured safely or reliably, leave it UNMEASURED rather than guessing.

What not to infer

Do not equate every fin-like extrusion with pile fin; leaf/flap is a continuous extruded body.

Additional guardrails:

• Do not infer brand/model compatibility from a family name or silhouette.
• Do not infer a universal dimension from terms such as “kerf,” “T-slot,” “pile,” “bulb,” “sweep,” or “felt.”
• Do not infer material composition unless it is marked, directly observed at the generic class level, or source-backed.
• Do not publish a fit/supersession statement without explicit authoritative evidence for that relationship.

Evidence and provenance

This page uses source-backed profile taxonomy, measurement rules and evidence boundaries. The site structure does not broaden the scope of the cited sources or establish exact replacement fit.

• Source — Ultrafab, Custom Plastic Extrusions | Profiles & Seals — https://www.ultrafab.com/product/custom-extrusions/ — supports: Distinct profile/interface labels including T-slot, kerf-mounted, leaf and multi-hollow bulb.
• Source — Ultrafab, Extruded Leaf & Flap Seals — https://www.ultrafab.com/product/extruded-leaf-flap-seals/ — supports: Leaf/flap as a legitimate extruded weatherseal profile family for window/door compression/sliding contexts.

Useful next steps

• Compression Weatherstrip Profiles — Profile family
• Measure Leaf & Flap Weatherstrip — Measurement guide
• Door Weatherstrip Identification — Application guide
• Window Weatherstrip Identification — Application guide
• Weatherstrip Terminology Guide — Terminology guide
• Weatherstrip Identification Methodology — Methodology

Integration note

Use the Weatherstrip Reference exactly as written. Do not create an alias page for the common terms above. Any original illustration used on this route must remain labelled “Reference graphic — schematic, not exact product depiction” unless a later exact record binds geometry to evidence.