Glass block windows aren’t fire hazards; fire-rated glass block windows can increase your home’s fire safety. Modern glass blocks are made with materials that can resist high temperatures and prevent fire spread. Most offer a 45-minute fire rating, while some increase it to two hours. Compared to the typical 20 to 90 minute rating for a double-pane window, glass block can increase your home’s safety in the event of a fire.

There aren’t many problems with fire doors except that they slow down or cut off ventilation at the higher rating levels. For this reason, work with a professional to ensure you have adequate ventilation throughout your house or workspace. The sealing around a fire door is meant to allow for a specific amount of ventilation and will need regular inspections to ensure adequate airflow.

It’s technically possible in some areas to install your own fire suppression system, but it’s usually not a good idea. Your system must conform to the fire code in your area and will need to pass a rigorous inspection before being activated and deemed safe. Installing a fire suppression system is a complicated job, and making mistakes as a DIYer is likely. Those mistakes can cause you to fail your inspection, which means you’ll have to spend more time fixing the issues or money to have a certified plumber do the work for you. It’s best to hire a professional.

The National Fire Protection Association (NFPA) says you can place smoke detectors on either the ceiling or the wall, depending on the setup of your room. Since smoke rises, the ceiling makes sense, but if you go with a wall mounting, the alarm should be installed high up—no less than 12 inches from the ceiling.