HOME > DOCUMENTS Documents NSN Listing | National Stock and Part Numbers for all of Wel-Fab's products. PowerPoint Presentation | A comprehensive slideshow of all of Wel-Fab's products and their uses. LIDS handout | Printable information on the Lightweight Inflatable Decontamination System. Airflight Certification for WFI-500 Airflight Certification for WFI-C-130, C-5, C-17, C-141, C-1, KC-135 Airflight Certification for WFI-MCC