Mechanical/Technical
The rating of your glass represents how energy efficient your glass is.
A Rated is the best glass for energy rating, while none rated is the lowest but also the cheapest.
The acoustic value represents how much sound the glass can dampen; the higher the acoustic value the more sound it can dampen. High acoustic glass is ideal for areas where there is going to be a lot of external noise.
The makeup of the units will change in line with your choice here.
For more information, please see the technical clear glass information.