Robin... there appears to be some 'ducting' behind yours in the picture taken (presumably) when you were fitting your DLRs, but this doesn't look as if it comes with either of the versions of the open grilles to which links have been given. Do I have to obtain this separately? I like the idea of the open grilles but worry about the untidy mess that would appear behind them if they're just large holes?!
Thanks,
Shaun