In article ,
Andrew Gabriel wrote:
Aren't these required by 'law' these days?

When I had mine done (just before Part L came in), trickle vents
were only required if the windows didn't have a lockable trickle/
slightly open position, which most do. The installer said LA's
and housing assocations insisted their properties has trickle vents
in the DG because tennants tended to do things which generated
excessive moisture resulting in damp, but private households
usually preferred their windows without. It made negligable
difference to price.

Ah. My only experience of UPC double glazing is the unit I bought from
Screwfix and installed myself. It came with fitted but closable vents
above the window and something about it being a requirement

--
*Plagiarism saves time *

Dave Plowman London SW
To e-mail, change noise into sound.