Climate Class N and ST are the names of the two variables for climate in which the tests are carried out. I presume a testing on doors would be done under different climatic conditions ex. tropical climate and temperate climate.
I can't tell from the figures. What is relative humidity minus?
I thought thawing means a change from molten state (as in ice) to liquid state (water). I don't know why it is applied to a door. Surely, you don't test a door by heating it until it melts. Sorry, it doesn't make sense to me though I am in the construction line.
not a teacher
Student or Learner