ONA Control Duct
ONA control duct neutralise odours in your duct permanently, with 5 different ONA block flavours fresh linen, pro, tropic, fruit fusion and polar crystal. With a small hatch to open and close without disconnecting from the duct.
We at Greendaze hydroponics recommend two ONA blocks as a minimum.
**ONA Blocks NOT included**
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Join two ducts into one. Male - Male - Male, so ducting can be sealed to each outlet. Strong durable galvanised steel construction.