Is this product concentrate that needs to be diluted?

Ann, yes this is a concentrate that needs to be diluted 1oz of concentrate to a gallon of water. Let me know if you have any additional questions.

What is the difference between this product and enz-3212? Also, like the enz-3212, can this be used in a fogger?

ENZ-3212 is a mold cleaner which combines 3 enzymes: protease (to remove protein), amylase (to remove starch) and lipase (to remove fat), which also quickly dissolves and removes mold and organic matter. ENZ-1284 Enzymatic Cleaner is a blend of enzymes in a low foaming solution formulated to loosen and remove dried debris, protein, blood and mucin deposits. The two products are similar in their action but use different combinations of enzymes in their formulations. Let me know how else I can be of assistance.American Air & Water

2. If I can use it in a fogging machine, do I first need to dilute it and then pour the dilute into the fogging machine?

This is a concentrate so it needs to be diluted prior to use. However, you may consider using the disinfectant solution RE-1284F which is ready to use and doesn't need to be diluted.

Is the item #8383-3 or 8383-7?

It seems to be the best desinfectante for Corina virus and many others one as well and right now this is a priority, I hope is true as well and does not discolor like bleach