plenum fan

plenum fan

A backward-curved airfoil impeller that is housed in a rectangular plenum; has ducted inlet and outlet connections; it is not enclosed in a typical volute scroll.
References in periodicals archive ?
The new Direct-Drive Plenum fan provides static efficiency improvements of 15-20 percent vs.
High-performance air handling efficiencie s using direct-drive plenum fans with Variable Frequency Drive (VFD) controls that reduce energy consumption when equipment is operating at part load, which is typically more than 95% of the time.
A FANWALL is an array of smaller, high-efficiency airfoil plenum fans.