Deluxe Copper ( http://www.luxurymetals.com/ ) dampered Roof Vent with screen for venting your kitchen appliances, ranges, dryers etc. Available online at http://www.luxurymetals.com/roofventwithdamper.html Sizes available 4", 6" and 8" round connection and 6" x 10" and 10" by 10" rectangular connection.
Copper Wall Vent (4 Inch) ( http://www.luxurymetals.com/coppervents.html ) with Damper and Screen. Used for fan exhaust or as a dryer vent (with damper only, no screen). Made of heavy duty 16 ounce copper. Our copper vents are heavy gauge and will last. Available online at http://www.luxurymetals.com/WallVents.html