On page 12 of the Sharper Image Owners Manual Ionic Breeze Quardra Silent Air Purifier it says to Release the Ozone Guard front grill and back grill by lifting the blue release tabs from the grill. I am unable to find any blue release tabs. Is this a model that does not have any. Under the base plate there are four screws that may be part of releasing the grill. Should I remove the four screws and then attempt to move the grill up? Dave