Air throughput adjustment device, notably for paint spray chambers

A painting structure comprising:

• a painting cabin having therein an enclosed chamber for the receipt of material to be painted;
• air inlet means opening into said chamber for introducing air thereinto;
• fan means for pumpimng said air through said air inlet means into said chamber;
• means for detecting the velocity of said air introduced into said chamber;
• means for adjusting the rotational speed of said fan means for maintaining the volume and the velocity of said air introduced into said chamber at constant predetermined values as a function of the volume of said material to be painted within said chamber;
• extractor means for removing said air from said chamber;
• and
• regulating means, operatively connected to said extractor means, for detecting the pressure within said chamber and for automatically controlling the operation of said extractor means as a function of said predetermined volume of said air introduced into said chamber.