Blowdown or Blowing down may refer to:Windthrow or forest blowdown, a felling of trees by windstorm Blowdown stack, a vertical containment structure at a refinery or chemical plant Blowdown, a process plant controlled or emergency depressurization Boiler blowdown, a steam-boiler process to remove impurities Blowdown, a television series focusing on explosive demolition Diving bell or hyperbaric chamber blowdown (diving), the compression of the pressurised chamber atmosphere, or displacement of ambient pressure water by adding high pressure gas through a blowdown valve. in mathematics, the inverse of blowing up "Blowing Down", song from the Digable Planets studio album Blowout Comb