Wow.fitted vents to windows.just the inside.no air coming in as its just screwd to inside of sash.i asked him to explane how that works then ?after him trying to convince me there was a draugh coming threw.he stopt talking after i told him ime a double glazing fittet for 41 years.also fitted a fan above the bath ,wich thay glued on with glue and activator .wich is coming away.as for the loft instalation is just layed on top of old.i found the electric junction box burryed under loft insterlation.reminded me of the yts sceam in the 80s.very dangerous fan.and will be geting it checked in morning.i know its free but i rather my 14 year old son done it.
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