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The middle range replacement window by OKNA manufacturer is Eco-Pro Series double hung. This type of the replacement window is called OKNA 600 Series as well.
Let’s see what is it in the window that many people love them.
Beauty of the window
Eco-Pro Series are available in interior woodgrain colors. The frame of the window is slightly thicker than Precision-Weld Series (Okna 400 Series windows).
The Interior of the window makes your room much more cosy and comfortable. The round edges of the window frame enhance the beauty of the room. All the balance channels of the window have the balance covers, this way no dust or spider web is gonna accumulate in these channels. Night vent latches are standard as well. You can vent just the couple of inches at the bottom or at the top of the window. Eco-Pro Series windows have a slim looking sash lock with many color options.
The thickness of the frame and sash of the window combined is 3 1/4, slightly on the bigger side. If you have smaller windows in your house, it may make them look even smaller. If your windows are bigger in size, then you are not gonna notice the loss of the the glass area.
The Exterior of OKNA Eco-Pro Series window has an appealing modern look. You can tell that when you look at the slightly beveled and rounded screen channel of the window. Once Okna 600 windows installed into your house, they become a beautiful part of it.
Performance of the window
Okna Eco-Pro Series double hung windows have very high energy efficiency ratings and very low air infiltration ratings. The U-Factor of the window is 0.25, the SHGC is 0.27. The window has triple layer of weather stripping on top and the bottom sashes. There is an air bulb between the both sashes, as well as at the bottom window sash. All that adds to good air infiltration rating of below 0.02. Both sashes close as tight as the door of a fridge.
The balance system of the window is block and tackle system. It can achieve more than 28000 cycles. You can close and open your window that many times and still it is gonna be working.
Quality of the window
The frame of the widow is made from virgin vinyl. It means that the vinyl used in a window was not recycled. It is used for the first time in the frame of your window. Block and tackle system is maintenance free and does not need any adjustment or lubrication. The whole frame of the window is fusion welded for enhanced beauty and extra durability. High performance HeatSeal Spacer is used between the two glass chambers of the window. It prevents any moisture to accumulate in the space between the two glass panes.
The frame of the window has High Density Composite Reinforcement. It makes this window extremely durable and 171 mph wind resistant. Both sashes are foam filled for extra energy efficiency.
Eco-pro series window advantages and disadvantages: