Metallic Variety Manufacturing has actually been giving air control dampers with the professional and light industrial markets given that 1967. Control dampers are available with parallel or opposed blades in possibly the business typical triple “V” groove design or Airfoil style. Watch out for uneven heating or cooling, strange noises https://air-control-dampers-for-h45677.thezenweb.com/getting-my-air-control-dampers-for-engine-sheds-to-work-74765470