Potential answers for "Device on a duct"

⭐⭐⭐⭐ VALVE
⭐⭐ MAIN
⭐⭐ CANAL
⭐⭐ VAS
⭐⭐ AIRVENT
⭐ SEMAPHORE
⭐ PITCHPIPE
⭐ FLUE
⭐ TVCAMERA
⭐ MODEM

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