does the convection/ room blower on a 25PDVC have a gasket, I need to take it off and clean it. I have somehow missed it in spring cleaning a couple of times. I don't want to get it apart and not have heat til a gasket gets here if it has one. I do have a furnace but I am almost out of HHO so don't want to rely on that. It needs to be cleaned because it does not increase in speed above setting 3 and another post I read said that it was most likely dirty and need