According to the manufacturer that is correct. External noise is 70 - 80db.
Apartment is about 7.5m away from main road.

Building is only 9 months old. Seals and everything else seem good. The window is nearly 1800x1800 so decent sized. If I put my ear up to the different surfaces,…

I live on a busy main road and my current window is letting in too much noise. Due to it being an apartment replacing window isn’t an option. Existing window…