metal shred from installed air duct

actuator ahu air and architecture boxfanair building circle clean coil cold conditioning connected connection construction control diffuser duct ducts engineering equipment exhaust factory fan fancoil fans flexible foil foiled from handling heater heating hot industrial industry inside installation installed launch machine machinery mad metal mixing nprocess old parts pipeline pipes plant plastic point prepared pressure process production rectangle rejection shred stainless steel suppliy supply system technology tool tube unit valve ventilation view water work