A system and method are provided for selectively tilting side mirrors located on the driver and passenger sides of a vehicle. Such compounds are useful in the treatment of Alpha-1A mediated diseases or conditions such as urinary incontinence. The filter assembly includes a cylindrical porous filter basket that is completely lined with a filter bag. The material of the second component is selected only if G\u2032 is a certain value at a specific temperature and frequency range. The Pvortical -dominated filtered signals Pasf1,Pasf2 from the two regions 14,16 are cross-correlated by Cross-Correlation Logic 50 to determine a time delay \u03c4 between the two sensing locations 14,16 which is divided into the distance \u0394X to obtain a convection velocity Uc that is related to an average flow rate of the fluid flowing in the pipe 12. Said regulator is embodied as a multiple regulator which detects several temperatures as control variables andor adjusts several heating performances as manipulated variables.