AprilAire’s evaporative humidifiers for forced air furnace systems have been a leading option since they were first introduced back in 1954. These whole-home models work by piping water into the distribution tray at top of unit, which is then evenly distributed across its width and through scientifically designed outlets that direct it flow downward onto an evaporation surface made up entirely from panes filled with moisture rich vapor responsible for turning same into something you can breathe easier knowing will keep your family comfortable all year long!