EnviroCare Premium Replacement Secondary Filter for Hoover Windtunnel Vacuums, White

Will this replace a Hoover part number AH41001?

How often do you change this filter?

Is this a hepa filter? if it's secondary to the hepa where is it located in the machine? i see the hepa location but nothing else. thanks!

My hoover is model uh74200, high performance swivel. i need the rinsable filter that wraps around the one in the dirt cup. which one is compatible?