The ROOTS-type rotary lobe blower is sometimes called a block, air end, blower block, exhauster, and sometimes inaccurately called a pump, vacuum pump, gear box and motor.
A blower is a machine which is externally driven by a power source. It has intermeshing, contactless lobes which rotate within a case. The remaining negative space in the case will hold a volume of air, so that when the lobes are rotated; a set volume of air moves from the inlet to the outlet side of the blower.
Blowers are designed to move air; and in specialist cases, other gases only. "Pumps" are used to move fluids.
ROOTS rotary lobe blowers typically have 2-lobes or 3-lobes: bilobe and trilobe respectively.
