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The SOUTHWARK METAL SL24-26GA_4IN is a hot-dip galvanized steel round pipe section used in low-pressure HVAC duct systems. Measuring 4 inches in diameter and 24 inches in length, this pipe is fabricated from 26-gauge galvanized steel using a snap-lock seam construction. It meets ACCA and SMACNA standards, making it a code-appropriate choice for residential and light commercial trunk-and-branch and radial duct layouts. Sheet metal contractors and HVAC technicians install this type of pipe as a straight run section connecting air handlers, furnaces, and air conditioning equipment to branch duct networks.
This round pipe section is suited for residential and light commercial supply and return air duct systems. The 4-inch diameter is a common branch size for individual room supply runs off a main trunk. The 24-inch length works well for short straight sections between fittings, transitions, or register boots. Installations conforming to SMACNA duct construction standards will find this pipe meets the required gauge and fabrication method for low-pressure round duct at this diameter.
Designed as a standard round duct pipe section compatible with 4-inch snap-lock and slip-fit galvanized duct fittings, collars, and boots used in low-pressure HVAC duct systems built to SMACNA and ACCA standards.
Sheet metal contractors and licensed HVAC technicians typically install round duct pipe. Shut down the air handling equipment and lock out the system before making duct connections. Joints should be secured with sheet metal screws and sealed with mastic or UL 181-listed tape per SMACNA duct construction guidelines and local mechanical code requirements. Avoid over-compressing or deforming the snap-lock seam during handling, as this can affect the fit at connecting fittings.
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