KEWIL Blain Air Permeability Apparatus IS : 4031, IS : 5516, BS : 4359 Part-II The apparatus comprises one each of permeability Cell āUā tube manometer with stop cock mounted on a laminated wooden stand, perforated metal disc, plunger, Rubber, Stopper, Rubber tube with rubber bulb. Spares : a) Laminated wooden stand with āUā tube monometer with stop cock. b) Permeability Cell complete with perforated metal disc, non -perforated disc and