Standard round duct configurations and fittings detailing geometry for HVAC distribution systems. Ninety-degree and forty-five-degree elbows feature a centerline radius of one and a half times the diameter. Size transitions maintain a maximum taper angle of fifteen degrees. Branch connections include forty-five-degree takeoffs, ninety-degree low-loss takeoffs, and round-to-round forty-five-degree branch junctions connecting main ducts to branch ducts.
90° LOW LOSS TAKEOFF 45° TAKEOFF SIZE TRANSITION 90° OR 45° ELBOW ROUND DUCT R=1.5D 15° MAX ROUND BRANCH ROUND MAIN ROUND TO ROUND 45° BRANCH 45°
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