Abstract: An internal aircell inside a first flexible structural cover of a structural air-beam used in air supported supports such as tents is connected to the internal aircell of an adjacent air-beam by means of an air-beam aircell communicating airflow port assembly attached between said aircells through a cooperating structural cover port aperture in the structural cover. The airflow port assembly allows communicating airflow between the connected aircells forming an integral air volume for inflation and deflation through a single inflation point.

Abstract: An inside stay berm unit incorporates a plurality of inside stays each stay connected to the interior of the berm unit by a plurality of stay securement tapes. Each respective stay is a respective closed ring after the stay is threaded through and retained within at least one respective wing aperture in at least one floor stay securement tape and at least one wing aperture in at least one sidewall stay securement tape and through at least one wing loop aperture in a sidewall top edge stay securement tape and closed by a closure means. The invention allows easy removal and replacement of any damaged stays.

Abstract: An inside stay berm unit incorporates a plurality of inside stays each stay connected to the interior of the berm unit by a plurality of stay securement tapes. Each respective stay is a respective closed ring after the stay is threaded through and retained within at least one respective wing aperture in at least one floor stay securement tape and at least one wing aperture in at least one sidewall stay securement tape and through at least one wing loop aperture in a sidewall top edge stay securement tape and closed by a closure means. The invention allows easy removal and replacement of any damaged stays.

Abstract: A plurality of closable and removable containment berm wall supports are preferably each made from three flexible coated fabric layers and preferably each wall support incorporates three reinforcing members and incorporates a closure means that selectively can close the support into a closed triangular frame. Each berm wall support is designed to cooperate with a sleeve attached to a flexible sidewall of a containment berm unit and when the wall support is in a closed condition to hold the sidewall in an erected condition and when the wall support is in an open condition to allow the sidewall to assume a let down condition. The let down condition allows a wheeled vehicle or other object to conveniently transit over the wall for placement on a floor of the containment berm unit within the perimeter established by the sidewall.