RMB110 ea for 310mm x 281mm x 45mm HEPA. Gives about 15kph windspeed at the outlet. Need to aliwangwang and chat with the seller to give the dimensions, but he knows what to do lah....coz have sold a few liao.
This is just a link to the seller's shop....not for the item.
http://item.taobao.com/item.htm?spm=a1z09.2.9.162.ZaWosI&id=20676620186&_u=t1u0hcib32b0
The RMB26 HEPA also can be cut to fit the Samsung AX40. But airflow is 12.5kph. Good enough for daily use.
Wattage when using the RMB26 HEPA is 19W for the AX40. Wattage when using the RMB110 45mm depth HEPA is about 27W. Measured by a DMM at the power socket. So it's maciam like a manual fan speed control.
And no matter what, be it Sharp original HEPA or customised taobao HEPA or your own specially cut up HEPA, all must use the plastic packaging/tissue paper and roll them up, stuff them in with a ruler/flat blade screw driver, plug up the sides to prevent bypass. They will work ok as long as , don't worry, I have measured many times.