One of the first things you can do is so simple, many renters forget it: install and check smoke detectors. While the building you are renting should already have smoke detectors put up, not all of them do. Make sure that you put smoke detectors though the building according to your local fire department's suggestions. If the building already has smoke detectors in it, make sure to test them every month. Batteries should be replaced every six months, or as needed. If you have new tenants moving in, replace the batteries and test the detectors before they settle down in the building. This is a quick, easy, and inexpensive way of showing that you care for their well being.
Another simple thing that you can do is to supply a couple of fire extinguishers for your rental property. Although these are a little more expensive than other items on this list, they will still only run you an average of $40 to $50 which, in the long run, is a small price to pay for assurance that your tenants are safe. Simply check to make sure the pressure gauge is in the green and there are no breaks or cracks in the hose to be sure that it is still functional.
Another thing that you can do before a tenant moves in is purchase and install a carbon monoxide detector. Although carbon monoxide is less common, it still accounts for an average of 430 unintentional deaths in America every year. Since carbon monoxide is colorless and odorless, it is likely to go unnoticed unless there is a detector in the building. They cost around $20 to $25 on average and can (and have) save lives.
All in all, keeping your tenants safe just takes a little bit of pre-planning. Although it is a tad bit more work for you, they will be extremely grateful if one of these steps happens to help save their lives.