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Multi-position (upflow, downflow, horizontal left, horizontal right) without modifications * 0 Modifiable for side-entry return air . Low-flow, high-head pump custom designed to work with Rinnai's tankless water heaters . Integrated control board with learning algorithm . No combustion air infiltration losses when used with a Rinnai tankless water heater . Four selectable heat blower off delay times . Multi-speed motors (ECM) . Strong 20-gauge steel cabinet 0 Galvanized, painted 0 Fully insulate