In other words, is not the material in the air on the low-e film material damage.
I have encountered such a problem, manufacturers do not recommend using a single piece of coated glass. Film is easy to fall off, and cleaning is also a problem, the film is easy to scratch, but the owners insist on no way ah. Glass manufacturers give something, and then sent a letter to the owners to confirm that the owners adhere to the words, use chanting.
Online can, but the energy efficiency is relatively offline
Offline can not be used in a single layer, the film can be oxidized!
Online coated glass after the steel should be able to monolithic use it
