The requirement is for a dual-wall insulated aluminum spiral duct system with 30-inch inside diameter and 34-inch outside diameter, using 0.040-inch aluminum walls and 2-inch fiberglass insulation at 1.5 lbs/cu. ft. with internal I-beam spacers every 8 inches. It includes 140 feet of straight dual-wall spiral pipe, four 90-degree 5-piece gored elbows, and two 45-degree 3-piece gored elbows, all with a 45-inch centerline radius. The system also requires one reducing lateral cross fitting with a 30-to-28-inch main and two 12-inch branches at 45 degrees. Flange and connection items include 41 AccuFlange assemblies for the main 30x34 pipe and elbows, 21 34-inch QuickDraw clamps with self-sealing rubber gaskets, one 28-inch flange, and two 12-inch flanges. All flanges for the main pipe, elbows, and reducing cross ports must be factory-installed for proper alignment and airtight connection.

The requirement is for a dual-wall insulated aluminum spiral duct system with specified components. It includes 140 feet of 30-inch inside-diameter straight dual-wall spiral pipe, four 90-degree elbows, two 45-degree elbows, one reducing lateral cross fitting, 41 main-pipe flange connections, 21 QuickDraw clamps, and flanges for 28-inch and 12-inch ports. The straight pipe and elbows are aluminum with 0.040-inch walls and 2-inch fiberglass insulation at 1.5 lbs/cu. ft., with internal I-beam spacers every 8 inches in the straight pipe. The elbows are 5-piece or 3-piece gored with a 45-inch centerline radius, and the reducing cross fitting transitions from 30 to 28 inches with two 12-inch branches at a 45-degree angle. Flanges must be factory-installed on pipe, elbows, and specified ports, while the 34-inch clamps must include built-in self-sealing rubber gaskets for airtight outer flange connections.

The requirement covers a dual-wall insulated aluminum spiral duct system with 30-inch inner/34-inch outer diameter, 0.040-inch aluminum walls, and 2-inch fiberglass insulation at 1.5 lbs/cu ft. Components include 140 feet of straight pipe, four 90-degree 5-piece gored elbows, and two 45-degree 3-piece gored elbows, with 45-inch centerline radius where applicable. Also included is one reducing lateral cross fitting with a 30-to-28-inch main reduction and two 12-inch branches at 45 degrees. Connection items include 41 AccuFlange assemblies factory-installed on pipe and elbow ends, 21 34-inch QuickDraw clamps with self-sealing rubber gaskets, one 28-inch flange, and two 12-inch flanges for the cross-fitting ports. All specified components are aluminum and must meet the listed dimensions, construction, and insulation details.