Abstract: A ventilation system and a method for producing the ventilation system are provided. The ventilation system includes an air vent including an entangled core and a separation layer formed on a side of the entangled core. The entangled core includes air space. A method for producing the ventilation system includes bonding the entangled core to a surface of the separation layer to form an air vent.

Abstract: A sound control mat includes a waterproof separation layer, an entangled monofilament structure, and a meltblown nonwoven. The sounds control mat provides improved sound control such as improved impact insulation.

Abstract: A liquid transportation container is substantially rectangular in shape and includes a rectangular container body and an upper flange portion in the form of a sleeve which attaches to the upper edge of the container body. The upper flange portion is separate and is attached by engagement between two shoulders defined around the upper portion of the container body and held in place by a strap wrapped around the upper flange portion. The top wall of the container has two openings one of which is arranged at a height above the other thus forming an inclined wall extending downwardly from one opening adjacent one side wall toward the second opening adjacent an opposed side wall. The second opening is retained within a recess. The first opening is arranged immediately adjacent the side wall to allow complete draining when the container is inverted.

Abstract: A septic tank is formed from a plurality of tank modules each of which comprises a substantially closed container. Each tank module is bolted to a next adjacent tank module at a flat end wall thereof with the bolts being of large diameter and in some cases including a central longitudinally extending opening so that the bolts act to communicate fluid from one tank module to the next adjacent tank module. Each tank module is shaped with an upper wall part which is of parabolic arch shape and a base wall which is substantially flat. This defines the optimum shape for strength to accommodate the forces when the tank is buried. Tanks can thus be formed in modular parts so that various different size modules can be connected together by the above coupling technique to form a multitude of different sizes of tank.