Air filter sucked into HVAC unit?

Get a sheet of cardboard and a utility knife, then spend a little time cutting and trimming it down to where it fits nicely in the hole/filter tray (when the thing isn't running), then go shopping. On a guess, you may need an 18x24. Note that filter sizes in a store are "nominal", not actual size - that's a bit smaller.

Plan B: get an HVAC tech in there, a 'jump on Fall/heating season prep, and let him get it right.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.