How should a ventilation shunt be to comply with regulations?

How should a ventilation shunt be to comply with regulations?

According to the regulations, ventilation shunts must be vertical ducts with a uniform section and lack obstacles throughout their length

clean air ,  ventilation ,  mechanical ventilation ,  CTE HS ,  hybrid ventilation ,  air flow ,  admission mouth ,  extraction mouth ,  conduit ,  ventilation shunt
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