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This is a nearly air-tight window, tested for high performance in 140MPH wind tunnels. Look no further if you want high quality and affordability. It is not the least expensive window out there, but it is nowhere near the most expensive. Our 7400 line carries all of the same standard features of the Patriot 3000 series and more:

• 3 thick bulb seals which create an air-tight seal when compressed. These are located at the most vulnerable points for air infiltration, at the bottom, in the middle and at the top. 
• Interior bottom extrusion lip – when the bottom sash is pushed down into the frame, the entire bottom section of the sash is covered and sealed to further prevent any possible air infiltration. 
• Continuous over-under interlocking sashes means that when you lock your windows, the middle section is locked air-tight and the bottom and top sashes line up perfectly, every single time. 
• True sloped angled sill. Our sills are welded into the frames of the window (and also insulated) at a downward angle and feature drain holes, a far superior system than weep holes which get easily clogged. When it rains, the sill pushes the water to the edge and out through the drain holes – it’s that simple!
• Energy efficient glass with argon gas fill (invisible attic insulation) and low-e coatings to reflect solar heat away from your windows keeping your house cool in the summer at a minimal cost.