Description
A typical minimum duct spigot offset detail for HVAC ductwork, showing how take-off spigots on opposite sides of a duct are staggered to stop noise passing straight across between rooms. One arrangement offsets the two spigots by at least 600mm along the duct; the alternative keeps a smaller offset but adds a 1000mm-long internal baffle plate riveted to the duct between them – both breaking the direct line of sight so sound (crosstalk) is not transmitted through the ducting.
It is a reusable acoustic standard for mechanical drawings, especially between bedrooms, offices or consulting rooms served off a common duct. Drop it in and set the offset or baffle to suit your layout.
See also the duct connection detail and the ductwork construction schedule in the building services details category. A free AutoCAD DWG download.
