SMARTair SMARTair, Mul-T-Lock's friendly access control solution, upgrades your security to an entirely new level - with very little effort on your part. SMARTair is friendly from the start, offering extra-easy installation that does away with costly and complex procedures. All you need to do is mount SMARTair directly onto the existing mechanical lock - no wiring required! And don't worry: it fits almost any lock in just about any type of door - including glass doors, interior doors, emergency exits with panic bars, lockers, cabinets and more. SMARTair. Convenient, Effective Access Control.