Unmatched by any other NSHEV-certified product: the Lacker bigAir^® louvre window is NSHEV-certified for a height of up to 6,000 mm and a width of up to 4,895 mm – sizes hitherto unequalled by any other louvre window worldwide.

Just as impressive is the world record held by the bigSwing top-hung window, which passed the NSHEV test for a width up to 5,000 mm.