For connecting ducting together or for branching off.
A Duct Joiner is useful when you wish to use one extractor to draw air from 2 growing areas or 2 areas in 1 room. When using a Duct Joiner you will probably want a Damper Unit as well to ensure you get the air flow you desire from each of your growing areas.
If you wish to use the duct joiner it's as easy as connecting the ducting straight up to the joiner.
