An excellent but simple idea from ONA. These duct air filters are simple to install on your exhaust ducting. Air extracted from the growroom blows over the ONA blocks and removes any rogue odours leaving the expelled air smelling only of your favourite ONA fragrance. Simply add the number of ONA blocks you require to the filter through the hatch, no need to disconnect the ducting.


  • All sizes from 4 inch to 12 inch
  • Easy to fit
  • Removes stray odours
  • Uses ONA blocks
Weight N/A

4 Inch – 100mm, 5 Inch – 125mm, 6 Inch – 150mm, 8 Inch – 200mm, 10 Inch – 250mm, 12 Inch – 315mm

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