Round Ventilation Nipple with Seal

A round galvanized steel ventilation nipple is a fundamental connecting component engineered to join straight sections of round air ducts. When installing extended duct runs, a rigid, secure, and perfectly tight pipe-to-pipe connection is indispensable. This calibrated fitting quickly links two duct lengths into a single continuous airflow line, minimizing system pressure drop, preventing air leakage, and ensuring the stable performance of the entire supply or extract ventilation network.

This component features a dual-sided male connection profile designed to insert directly inside the matching ventilation pipes. A factory-rolled center stop bead runs along the middle of the casing to align the fitting perfectly at the joint, preventing axial displacement during assembly and guaranteeing accurate centering. Crafted from high-grade structural galvanized steel, it provides reliable defense against mechanical wear and corrosion under conditions of standard relative humidity.

Key Benefits of the Round Ventilation Nipple

• Airtight joint isolation without liquid mastics: The pre-installed double-lipped EPDM rubber gasket forms a dense dual sealing contour against the inner walls of the air ducts, effortlessly achieving the highest industry rating — Airtightness Class D without requiring messy tapes or liquid sealants.
• Maximum structural durability at the weld seam: The longitudinal joint of the element is executed via fully automated linear seam welding, which preserves the structural integrity of the fitting and leaves the protective zinc layer entirely intact.
• Safe handling and reinforced radial stiffness: The collar edges are processed with machine-turned SAFE technology (up to D-400), creating a rounded rim that protects installers from accidental hand cuts and reinforces the shape against external mechanical loads.
• Accurate alignment with a built-in stop bead: The central raised rib ensures the nipple stays perfectly centered between the two connecting pipes, accelerating on-site assembly and eliminating installation misalignment.

Technical Specifications and Dimensions

• Base Material: DX51D grade structural galvanized steel
• Zinc Coating Layer: Z275 (275 g/m²)
• Metal Thickness: 0.5 mm to 0.9 mm (calibrated based on nominal diameter)
• Connection Profile: Male (inserts directly inside a straight duct)
• Quality Standard: Full compliance with EN 1506:2007

Round Nipple Dimensional Data

Assembly and Application Guidelines

This nipple is specifically engineered for pipe-to-pipe connections. If the project layout requires linking two fittings directly together (such as an elbow to a tee or two elbows), a nipple cannot be used; a female sleeve coupling (duct coupler) is required for that purpose. Secure the overlapping connection node using standard blind rivets or self-tapping sheet metal screws.