What of the following are recommended safe work practices for recovering refrigerants?

1. Use proper personal protective equipment (PPE). Refrigerants are toxic and can cause serious health problems, so it's important to wear the proper PPE when working with them. This includes gloves, eye protection, and a respirator.

2. Work in a well-ventilated area. Refrigerants can be harmful if they're released into the air, so it's best to work in a well-ventilated area to avoid breathing them in.

3.Ensure recovery cylinder is within the charging/discharging limits as per nameplate. Cylinders have specified temperature and pressure limits. Recovery into overcharged cylinders can lead to cylinder ruptures.

4. Use the proper recovery equipment. There are a variety of different recovery machines available, so it's important to use the one that's right for the job.

5. Follow the manufacturer's instructions. Each recovery machine has its own specific set of instructions, so be sure to read and follow them carefully before operating it.

6. Never recover refrigerant from a leak. Recovering refrigerant from a leak can be dangerous and can cause the leak to get worse. If you find a leak, you should call a qualified technician to have it fixed.

7. Dispose of recovered refrigerant properly. Recovered refrigerant must be disposed of properly in accordance with local regulations.