Greenheck's ESD-635PD and EHH-601PD penthouses can function as gravity ventilators or equipment enclosures. Approved for use inside or outside Florida's high-velocity hurricane zone, they feature 6-in. louver blades, all-aluminum construction, and a maximum design wind load of 115 psf. The penthouses comply with Florida test protocols TAS 201, 202, and 203 and are available from a 12×12-in. throat size and 12-in. height, to the largest in the industry at an 84×108-in. throat size and 84-in. height.