Although our DIY Prior Conservatories normally come supplied with a minimum of two top opening windows, there is no reason why you should only have this type of opener in them. Another option for better ventillationn would be a side hung window as lng as it is not too large, or a top hung window that pushes out from the bottom.
Just let us know what you want and we will incorporate these other opening windows into your design. We recently made a conservatory with every other window being a tilt and turn type. Versatile, that's what we are!