Superior 4" Air Kit with Collar, Hood & 3' Flex - AK4The Superior Outside Air Kit with Collar, Hood & 3 Foot Flex Pipe provides a premium accessory for use with your gas fireplace. This outside air kit offers an optional venting solution to help you get the best performance out of your fireplace unit. This kit includes a collar, hood, and three feet of flex pipe. NOTE: See fireplace owner's manual for compatibility information and installation instructions. Product Features Premium Design Optional