On Wed, 19 Dec 2007 03:07:18 -0800 (PST) wrote :
The problem is with the 300mm height as I am keen to hide it in the
space between the floor and ceiling above. With this spec, it will
be 150mm below the ceiling level which is not ideal.

If it has to be a 7m span, which is a lot in a domestic situation,
then you probably don't have many alternatives.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk