Abstract: A modular assembly is provided for managing the flow of fluid beneath a ground surface. The assembly can feature a plurality of modules, each having a deck portion and opposing sidewalls extending downward therefrom. The opposing sidewalls can slope outward and away from one another as they extend downward from the deck portion. The modules further comprise a shoulder for supporting a link slab, and to support and separate modules that are stacked during transportation or storage. The sidewalls can define an interior fluid passageway having a flared configuration from top to bottom. The link slab and sidewalls of adjacent modules can define an exterior fluid passageway in fluid communication with a lateral fluid channel. A method is also provided for making a precast concrete module for use in the modular assembly.

Abstract: A modular assembly is provided for managing the flow of fluid beneath a ground surface. The assembly can feature a plurality of modules, each having a deck portion and opposing sidewalls extending downward therefrom. The opposing sidewalls can slope outward and away from one another as they extend downward from the deck portion. The modules further comprise a shoulder for supporting a link slab, and to support and separate modules that are stacked during transportation or storage. The sidewalls can define an interior fluid passageway having a flared configuration from top to bottom. The link slab and sidewalls of adjacent modules can define an exterior fluid passageway in fluid communication with a lateral fluid channel. A method is also provided for making a precast concrete module for use in the modular assembly.

Abstract: A combination filter and register for a heating, ventilation, and air conditioning system includes a register mounted in a structure and a filter. The register includes a plurality of parallel blades and a plurality of vane members, with a space defined between the two. The register does not have a dedicated access opening. The filter includes a pliable rectangular frame with a pliable filter material spanning it. The pliable filter material and pliable frame allow the filter to be inserted between two of the plurality of parallel blades, or between one of the parallel blades and an edge of the register, for placement of the filter into the space between the blades and the vanes without removing the register from the structure in which it is mounted.

Abstract: A combination filter and register for a heating, ventilation, and air conditioning system includes a register mounted in a structure and a filter. The register includes a plurality of parallel blades and a plurality of vane members, with a space defined between the two. The register does not have a dedicated access opening. The filter includes a pliable rectangular frame with a pliable filter material spanning it. The pliable filter material and pliable frame allow the filter to be inserted between two of the plurality of parallel blades, or between one of the parallel blades and an edge of the register, for placement of the filter into the space between the blades and the vanes without removing the register from the structure in which it is mounted.

Abstract: A filter is used in combination with a register for an HVAC system, where the register is mounted to a wall, floor, or ceiling. The type of register used in this invention has a plurality of parallel blades which are located on the exterior side of the register and a plurality of vane members set behind the parallel blades, where a space is defined between the parallel blades and the plurality of vane members. The filter has a pliable rectangular frame and a pliable filter material spanning across the pliable rectangular frame. The pliable rectangular frame and pliable filter material allow the filter to be inserted between the blades for placement in the space without removing the register from the wall, floor or ceiling.