cubic feet per minute

Today I learned that you can't get a 400 cfm air cleaner for less than $450. This is only interesting if you want to pressurize your house against pollen and run your 200 cfm clothes dryer at the same time. See, I could get a 200 cfm air cleaner, but those all report cfm before the filters, so I'd have to run it in parallel with my regular pressurizer, and I'd have to build it a fancy box, the details of which I'm too tired to explain.

So, have a picture of some shooting stars.