The acoustic insulation of a door is greatly affected by the sealing of the bottom gap. The International Standard ISO 140 sets the methods and environment to measure the sound insulation value, Rw (dB), specifying the total sound insulation value of a door with the automatic door bottom installed on.
The results of the tests are specified some diagrams.
a. automatic door bottom seal Igloo operated down,
b. gap from door bottom to floor, with a defined height, completely filled with sealant,
c. gap from door bottom to floor, with a defined height, automatic door bottom seal operated opened,
d. reference diagram to evaluate the weighted insulation factor, Rw.
The Italian ITC-CNR laboratory has carried out the tests on several typology of products; hereinafter a summary of the main results: