All, Just looking for some quick advice - I previously posted a photo of my brick smoker under construction. I was going to use 2 x air bricks one either side at the fire level to allow air intake and form a chimney on the concrete lid as an outlet. Roughly how much air intake would I need at the bottom and roughly what size might the opening at the top be? The air bricks at low level I was planning on using are basically brick size, and perforated. Below is an image of where im up to - the size of the smoke is roughly 450mm Wide x 590mm deep by about 1800mm high. Thanks very much for your help .