A twin fan option now available on Vision™ air handlers allows units to replace old-style air handlers, says the company. The two housed, forward-curve fans mounted on a single shaft provide air volumes that are comparable to larger fans, but occupy less vertical space. As a result, the low-silhouette units can fit existing footprints, or be hung from ceilings without the expense of a custom air-handler design or major building renovation, states the manufacturer.