title: Air-to-cloth ratio
text: # Air-to-cloth ratio
  
  The air-to-cloth ratio is the volumetric flow rate of air $(m^3/minute;$ SI $m^3/second)$ flowing through a dust collector's inlet duct divided by the total cloth area $(m^2)$ in the filters. The result is expressed in units of velocity.
  
      $v={V/\Delta t \over {A}}$
  
  The air-to-cloth ratio is typically between 1.5 and 3.5 metres per minute, mainly depending on the concentration of dust loading.
  
  