An aeration duct apparatus has a plurality of aeration tubes connected together by hollow connectors, each hollow connector defining at least three connection ports. Each aeration tube is connected at each tube end thereof to one of the connection ports, and each connection port is connected to a tube end such that the connected aeration tubes and hollow connectors form a substantially rigid structure. A transition duct is connected to one of the aeration tubes at an inside end thereof and is adapted at an outside end thereof for attachment to a fan. The aeration tubes and transition duct are configured such that air can flow from the fan through the transition duct into each aeration tube and out through a perforated area of walls of the aeration tubes.