A. A unique sill dam which extends into the window mainframe for unitized strength and seal.

B. Our interlocking sill-sash rail keeps the sash in place against the sill dam weatherstrip when the window is under extreme wind-load stress.

C. Our Q-lon® compression gasket system straddles the sill rail when the sash is
locked shut to add barriers and diversions for impressive water resistance.

D. Comfort-Foam™ insulation.