Phonic Trap Acoustic Ducting — Sound-Absorbing DuctPhonic Trap Acoustic Ducting The Quietest Ducting on the Market The gold standard acoustic ducting for grow room extraction Phonic Trap uses a multi layer design with acoustic foam wrapped around the aluminium flex core to absorb the sound of air rushing through. Dramatically quieter than standard aluminium flex, dramatically quieter even than most acoustic foam wrapped ducts. For growers who need serious noise reduction at source, not just after the