My projector has 160 hours on the clock now since Sept? 2001 when I bought it for £1299 !. The filter requires cleaning at 300 hours although I have checked it recently and its clean as a whistle?!. However anyone know if its ok to blow the innards of an LCD projector with a duster buster ?. I`m sure theres dust in there somewhere and the odd blow would be good for it perhaps?. Thanks! James p.s im off out to lunch to purchase a HOYA HMC FL-D filter, if I find one I`ll post my experiences with it!.