Roof Mounted Air Intake or Exhaust Housing units serve frequently as gravity ventilators, pressure relief units, fan discharge caps, spillways, fresh air intakes, and sight shields (for aesthetic purposes) for roof mounted equipment. The Silhouette of the Pennhouse is compatible with the Linea centrifugal exhauster line. This serves to maintain architectural harmony where units of both types are required on the same roof.Click here for more product informaiton: https://www.pennbarry.com/Catalog%20Home/Commercial/Commercial%20Specia…