Vikna.ua has a rating of 5.0 stars from 1 review, indicating that most customers are generally satisfied with their purchases.
Measure your hole and window carefully
Place the frame in the hole with a uniform spacing between the frame and the hole.
Lining the window in certain places (depending on the style of the window)
Install the opener, plastic cover and handle
Screw the window to the frame - not very fast, otherwise you can deform the frame
Make sure it runs smoothly.
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