Selling over $650 of brand new direct vent system components. Each piece is 8" diameter with a 5" sleeve. I have 2 that are 24" long, 2 that are 12" long, 1 that is 6" long and 1 that is 5" long. These are used for carrying combustion air and exhaust gases. This includes sealed appliances such as gas fireplace, stove or heater. Will sell separately, but prefer to sell as a package deal. Will consider reasonable offers.