American Metal Products Oval Gas Vent 5.8-in x 10.6-in Galvanized Steel Oval Storm Duct Starting Collar in the Duct Starting Collars department at Lowes.com
American Metal Products Oval Gas Vent 7.1-in x 36-in Galvanized Steel Oval Duct Pipe in the Duct Pipe department at Lowes.com
Silicone Cowl Ventilators
Oval Gable Vent made of Vinyl by Mid America Products
Marine City 316 Stainless Steel Oval Intake Vent Cover for Boat, Fount – Marine City Hardware
Panasonic WhisperValue® DC™ ENERGY STAR® Certified Ventilation Fan 4 in. Oval Duct, 50 to 80CFM, 0.9 Sones, 120Vac (Wall Mountable, Multi-Speed)
Screamin' Eagle Ventilator Extreme Air Cleaner | Harley-Davidson USA
AST-210 VENTILATOR OVAL TYPE - Alema Hardware
ASD-200 VENTILATOR OVAL TYPE - Alema Hardware
DuraVent 4GWARO Aluminum 4" Inner Diameter - Type B Oval Gas Vent - Double Wall - Round-to-Oval Adapter - VentingPipe.com