Hi Terri,
I might be able to help you with that! Try calling or visiting filtertechs.com. Just be aware that the dual tower unit will process 40,000 cu ft of Grade "E" air to oxygen compatible air. Your limitation is a 6 month installed life. If you are filling 80's, that is a lot of fills in 6 months. Basically a high volume level. You might want to consider a portable unit if your demand over 6 months is smaller.
Also understand that you MUST use stored air to supply the unit. It cannot be fed directly from the compressor. L. Factor lists this as a 20 cfm unit. That is based on a supply pressure of 3000 psi and an outlet pressure of 0. In order for the air to reach O2 compatability, the dwell time must be extended. This is accomplished by putting a flow restrictor on the outlet. As the down stream pressure(back pressure) increases, the flow will be reduced. As equalibrium gets closer the flow will decrease to a trickle. On average, with a 4500 psi supply(cascade) it will take close to 15 minutes to complete a nitrox fill in an 80, pp blending.
Craig
