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Circular air duct series
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Spiral straight tube
Elbow
Reducer
Tee/Cross
Plain end/Arc end
Internal connector/External connector
Air shutter/Checkair valve
End cover
Cabin going-through part
Connector/Duct plug
Hoop/Hose clamp
Hose
Mute duct
Straight pipe
Saddle opening
Access door
Tee
Hoop
Air shutter
Air supply outlet/Air return outlet
Grating
Other
Flange
Air return plenum chamber
Non-adiabatic reducer (F)
Non-adiabatic reducer (FS)
Pre-adiabatic reducer (PF)
Pre-adiabatic reducer (PFS)
Non-adiabatic eccentric reducer
Pre-adiabatic eccentric reducer (PFSD)
Non-adiabatic negative reducer (FN)
Non-adiabatic negative reducer (FSN)
Pre-adiabatic negative reducer (PFN)
Pre-adiabatic negative reducer (PFSN)
Cabin going-through reducer
Extended cabin going-through reducer