Limits of Use Approved for use in HVHZ: No Approved for use outside HVHZ: Yes Impact Resistant: No Design Pressure: +50/-50 Other: 4400 Max. Frame: 48" W x 72" H;
4400 Max. Sash: 45" x 72" H;
4400 Twin Max. Frame: 72" H x 72" W;
4400 Twin Max. Sash: 33" H x 30 H