1)Weather strip provides remarkable air tightness, reducing heating and air conditioning costs. 2)Interior glazing bead design constitutes a key security feature, allowing the window to withstand 350 km/h (220 mph) winds. 3)Our windows have the highest number of internal chambers, lending them outstanding insulation and sound abatement qualities, as well as thermal efficiency and increased strength. 4)Warm edge technology and high performance insulating glass result in energy savings. 5)Top of the line operating hardware and high-security multi-point locking system are included as standard features. 6)Open a full 90 degrees for ease of cleaning.