- Extruded aluminum frame
- Drop-in glazing – replace glass without disassembling frame
- Mounting Rail – mounts to parting stop 1/2 inch closer to house than other storm windows
- Rubber Interlock – seals midsection between glass panes
- Master frame Corners – screwed together in all 4 corners with 2 screws each – if house settles the window will move with it
- Metal Corner Keys – will not break off like plastic keys do
- Pre-Drilled Weep Holes – allow water and moisture to drain from window
