Round Ventilation Saddle Tap 45° with Seal

A round galvanized steel ventilation saddle tap 45° (also known as a 45-degree collar take-off or angled saddle take-off) is engineered to construct a smooth, inclined branch line from a primary round duct mainline. This phase fitting is widely used in supply and extract air systems across residential, commercial, and industrial facilities to introduce secondary lines without cutting the mainline run. Unlike standard perpendicular 90-degree junctions, the 45-degree angled profile ensures a gentle directional transition when splitting or merging volumetric air streams. This structural design minimizes internal static pressure losses, protects fan equipment from operational overloads, and prevents whistling or localized air turbulence noise within the ductwork.

This component is manufactured from premium structural galvanized sheet steel grade DX51D featuring a stable zinc coating mass of Z275 (275 g/m²). The sturdy metal frame retains its exact geometric profile under physical stress and remains highly resilient against atmospheric rust, guaranteeing a reliable service life for both supply and extract air paths under conditions of normal relative humidity.

Key Benefits of the Round 45° Saddle Tap

• Optimized airflow aerodynamics for quiet performance: The precise 45-degree angled incline allows air to merge or split with minimal structural resistance, preventing localized air vortexes and saving fan power.
• Airtight Class D isolation without liquid sealants: The connection collar features a factory-fitted double-lipped EPDM rubber gasket that tightly seals against the inner walls of the branching pipe, eliminating leakage and cutting down assembly time.
• Flush mechanical seat for zero wobble: The base contour is precisely calibrated to match the outer radius of the main duct line, simplifying on-site alignment and mitigating system-borne vibration noise during fan operation.

Technical Specifications and Installation Guidelines

• Manufacturer: SIA Akvilon
• Base Material: Galvanized steel DX51D+Z275 (industry standard)
• Optional Material Configurations: Stainless steel (AISI 430, AISI 304, AISI 316) or custom RAL powder coating
• Metal Sheet Thickness: 0.5 mm to 0.9 mm (calibrated based on nominal collar diameters)
• Connection Profile: Male (inserts directly into the branch pipe)
• Installation Insertion Depth: 40 mm to 100 mm (proportional to component scale)
• Compliance and Certification: CE marked, fully compliant with EN 12237 (Airtightness Class D) and EN 1506:2007

Engineering Blueprint Parameters

According to the technical drawing image_8b6dbb.png, the fitting dimensions are defined by the following precise structural variables:

• Mainline Diameter (D): Exactly curved to align flush against the outer perimeter of the primary air duct run.
• Branch Diameter (d): Calibrated with a male clearance tolerance to slide seamlessly into the secondary duct line.
• Collar Height (H): The insertion seating depth providing a stable mechanical overlap, ranging from 40 mm to 100 mm.
• Bending Angle (α): Fixed at a strict 45-degree incline to guarantee an optimal, low-resistance flow transition.

Recommended Assembly Practices

Trace and cut an angled opening in the mainline duct using a matching template for the saddle base profile. Apply a uniform layer of specialized HVAC polyurethane sealant onto the face of the curved mounting flange, then press the component firmly onto the pipe structure. Secure it mechanically along the perimeter using standard structural blind rivets or self-tapping sheet metal screws spaced at intervals of 60–80 mm. Slide the incoming secondary duct run over the rubber-sealed vertical collar until it hits the mechanical stop bead.