Dutch to French Tech/Engineering Mechanics / Mech Engineering Koelcel

Reading a list of components in a refrigeration unit (koelcel), I find:

Longen - Kleppen.

The lists also has: Kitwerk - Vlieswerk – Vloer - Vensters - Deuren - Doorvoeren.

These are the components that are tested in relation to a gaz proofing inspection (gasdichtheid)


I can't find a word for 'long' other than the body part.

Alvast bedankt.