There are basically two types of fires: smoky, smoldering fires that are best detected by alarms with photoelectric sensors and fast fires with flames that are best detected by alarms with ionization sensors.
Officials are looking into the cause of a fire that forced 4 people out of their home.
Fire investigators say the McKeesport home where a fatal fire started last weekend did not have any smoke detectors.
We changed the clocks this past weekend and firefighters are reminding everyone to also change the batteries in their smoke detectors.
Officials are urging people to change smoke detector batteries, along with changing back their clocks tonight.