Gyrobob wrote on 07/09/13 at 08:32:30:I like this, I can buy pre-drilled pipe either just holes, or louvered. But I've heard the louvered stuff is too restrictive. Plain holes is better for power and I'm more interested in performance than keeping my neighbours happy, I don't like them anyway.
Question about that diagram; you say to bend the edge of the hole facing the flow down to diver gas into the space above. Shouldn't this be the other way around? I would think the far edge of the hole from the incoming flow should be bent down slightly to catch the gasses and direct them out of the inner pipe.