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| English | Russian |
| free-burning | быстро сгорающий |
| free oxide | свободный окисел |
| free vent | свободный выход (в атмосферу) |
| free vent | свободный выпуск (в атмосферу) |
| free-vortex-type | свободновихревой |
| oil-free compressor | безмасляный компрессор (Using an oil free air compressor has a lot of benefits as it ensures an oil free air supply which is much cleaner economically with less contamination. Irina Verbitskaya) |