We are going to be replacing the third unit in this particular window because the ventilation
in the room isn't adequate with the small holes that have been drilled to extra triple
vents at the top of the window. The first thing we're going to do is to make absolutely sure things are out of the way
and then get a very sharp chisel or a very sharp wide bladed tool driver and we will
use that to pry out the beads from around the window. These will normally clip into the frame once we have glassed it in so to get them out we
just have to reverse that procedure using the chisel to pull out from the middle and
then the beads will unclip from the frame. Obviously we're going to do this all the way around the window but it's important to
remember to cleave the top bead in until rough and then you're not surprised by the pain
the filled unit falling out on top of you. So very carefully lever the bead down, being careful not to damage the rubber which sometimes
sticks itself to the window. Now you can see how they pull out nice and easy and that's the top one coming out
Then we'll drop the pane out and put that to one side and there you can see the 25mm
sealed unit. Clear the debris away, it's surprising how many bits of dust and flies and all sorts
of things find their way in. Look for the British Standard mark on the bottom of the sealed unit
You can see where that British Standard mark should be in the description and then using
some spacers underneath the sealed unit make sure that the sealed unit is absolutely square
in the frame in which you're placing it. You can see this one has got a mechanical air vent in there to make sure that the room
is insulated. Now there's a little tip when you're putting the beads back, put a little bit of washing
up liquid along the rubber of the bead and that will then allow you to slide that rubber
along the glass if necessary to clip it back into the frame
There are lots of ways beads clip back into frames, this particular one is a straightforward
push clip as it were. So we're using a block of wood to push up on the bead to avoid damaging the edge of
the frame and the fairy liquid allows that rubber to slide easily up the glass
If that fairy liquid wasn't there sometimes the rubber bites into the glass and it can
damage the rubber and make it a bit more difficult to see. So once you have them back in first, we're going to put these back in almost in reverse
order and then slide. You can see how the bead clips into the frame, push the corner in first, push down on the
bead, give it a tap and there really is a nice satisfying click as it clips into place
Repeat that obviously with all of the beads, don't forget the fairy liquid, just a little
drop and that keeps the rubber sliding down the glass nicely. When you come to the side, having put the top and bottom in, you'll see that the 3D
this installer has popped a little bit off the corner of the bead, that's not detrimental
at all, it just allows the bead to slot into the mitre a lot more easily and as you can
see there's a really really snug fit. So get both corners in first, both mitres in first and then tap from the middle down
to the corner to make absolutely sure of a really snug fit
And there we have a completely double glazed sealed unit fitted in
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