Sharp A28 is this one. This is 300mm x 300mm x 25mm, no edge. Must DIY squeeze some tissue at the sides to act as gasket.
I have tested and measured before, it's operating at 95% efficiency at 0.3 microns. Pretty ok.
RMB29.90 each only. Buy 2 and get 5% off. Buy 5 and get 10% off. Free ship to your China forwarding warehouse.
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Not sure about EP-A3000 size.
ALWW this seller and do custom. His filters are 97% efficient.
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These filters do more than enough even for the usual Sensitive/Susceptible Group folks. What matters is really to close the door and windows properly (turn on aircon) and also select an air purifier that does at least 5 air changes per hour for your room. IF can do 8X, do it. The absolute filter efficiency makes very little difference in real life.....from my testing and measurements.