There are small features built into UPVC replacement windows that are not immediately noticeable, but play a very important part in the overall performance in terms of energy efficiency & saving money on your household heating bills.
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these are thin strips built into the edges of the frames & windows, much like brush fibers in a strip, they reduce wind penetration & water ingress.
these upvc strips are used to clip into the frames and secure the glazed units into the window and should always be on the inside of the window for security reasons.
very important to make sure the window frames keep their shape over the years as if the frames warp they don’t’ fit tight and will start to let in draughts & water
some upvc windows are so air tight they can actually create condensation issues in the home, trickle vents allow controlled air flow and prevent condensation.
Small items, but if you buy UPVC windows without them being built in, you could be making an expensive blunder