ONA Air Filters give the ultimate in growers peace of mind. They are used in conjunction with ONA blocks for the neutralisation of unwanted odours in your ducting.

No more removing and unclipping all of your ducting to replace depleted ONA blocks. Simply install within your exhaust ducting and insert as many ONA blocks in the filter slots as required and when depleted, lift the lid and replace the block. The powerful neutralising effect of ONA destroys any remaining odour molecules.