Mike | September 13, 2016
SINGLE HUNG On Single Hung windows, only the bottom sash moves vertically up and down for ventilation. The lower sash operates with a stainless steel, coil spring balance system that will never need adjustment. Where the top and bottom sash meet, the meeting rail interlocks both sash around weatherstripping to prevent drafts. 5400 SERIES500 SERIES400 [...]
