I just thought I'd post a little blurb about how I get 50 eggs into my R-Com 20 and even have staggered hatches. The fan in the unit is very powerful, but because the humidity is precise and fully self-contained, it's not a problem usually. I have noticed that if one tries to perform a staggered hatch, raising the humidity will corrupt the eggs that are mid-incubation. If one doesn't raise humidity, then the eggs that are hatching will have issues with being stuck in the shell due to the intense air movement. What I have done to expand the capacity is to take a 7" piece of 1" x 1" trim on the outer edges of the expandable tray that has removable dividers for the base, and then to place the tray with the 20 ovals atop it and put a second level of eggs on it. Those can be used to place 2 eggs in each oval side-by-side except the outermost holes, which might prevent the lid from closing if you double-up. When hatching, during a staggered hatch, I have found that the top area can be used well if paper towels fully cover the entire oval tray and extend out over the top of the incubator, completely separating the area from the ventilation system. The air can still make it through, but without the 'wind' drying out the hatching babies. The humidity doesn't need to be cranked in this case, thus the eggs in the bottom can continue incubating at the appropriate humidity. The turner can also remain on, as the top eggs aren't on the turning floor. Just my $.02 and experience. Hope it helps some of you hatch-a-holics expand the capacity of your fabulous R-Coms!! Just think, if you did this with an R-Com 50, you could probably reach 150 or more eggs in a cycle!