As conclusion we choosed 2 type of size.Medium : 411*131*137Large : 484*131*137This size is based on Shenhua H02 H03 fan size.And based on these size, we add optional specs like filter, annion.Air volume doesn’t matter this step, as main test has finished already and passed.So, May I ask if you can adjust new sensor type to both size too(material : poly carbonate)?