Proportion-Air Legacy Products
Legacy products are older models that have been discontinued or will be retired soon. The products listed below are considered “legacy,” but some are still in production and available for purchase.
If the final obsolete date is known, we will list that below. All of the products that have been retired can be easily crossed-over into a newer model.
Discontinued Products
| Product/Model | Newer Version |
| BB-Series | QBX-Series |
| CB-Series | MM-Series |
Nearing Discontinued Status
| Product/Model | Newer Version |
| QBX-Series | |
| GP-Series | GX-Series |
| QPVT – Series | QPVM-Series |
| ISQB and ISF |