Full Face Mask

I want to make a positive pressure hood for use when we return to the new normal. it would be composed of:

a full face mask with a seal all around the face,

a hepa filter for incoming air, a blower capable of passing air through the heap filter and creating a positive pressure in the hood/fce mask of approx. 1 inch of water column, to prevent entry of outside (possible virus ladened) air. it must be powered by a battery.

this is NOT for use by medical workers

I am a retired engineer living in a nursing home. I have symptoms of COVID so I made not have a lot of time to play with this design. a quick response would be appreciated.