by matt walker » Tue Oct 22, 2013 3:36 pm
Well, for any regular j tube, you don't want to let any air in past the feed, period. If it's a regular L, like a cooker, you really want the air to come in below the fuel, which if you look at the approvecho designs they all have a means of holding the fuel off the floor so air can rush in under the fuel and past the burning tips. Peter's design is basically a J, with a different shaped feed, so his air inlet mimics the regular feed on a J. You definitely don't want to feed air into the riser.