How many windows will create enough ventilation for a 8x10 coop? I'm building a new coop and I'm concerned about ventilation and ammonia build up.I'm planning on a large doubled sided door and a window in front and 2 cross vent on each end near the roof.wondering if I should put in another small window in the back also for cross ventilation.There will be chickens sharing it (I know not recommended) with ducks.How many birds do you think will fit comfortably in this 8x10 space? Will this be enough ventilation? Does anyone have a special way of dealing with ammonia build up.I know lime usually will work but, I'd like to not have to use it or have the ammonia build up at all. Any advice?