SF146C Series — Double-Inlet Centrifugal Fans

Because the core is the largest single resistance in the machine: a counterflow plate exchanger plus its pre-filter commonly costs 150–300 Pa clean, and a loading filter roughly doubles that before you add ducts, silencers and the outdoor mesh. At 1,200 m³/h and 705 Pa, this blower keeps the nominal fresh-air rate alive across the whole service interval — the classic failure of undersized fans in HRVs is airflow decaying between filter changes, which quietly wrecks the indoor CO₂ budget.

One wheel fed from both faces: nearly twice the volume of a single-inlet wheel at equal diameter and speed, which is how 146 mm reaches 1,200 m³/h. The symmetric inflow also cancels most axial thrust, so the NSK bearings run lightly and the assembly keeps its balance at speed. In an ERV or appliance cabinet that means one compact blower replaces two, with a smooth, flat power draw across the range.

Follow the power stage already in the unit. The 310 V DC version exists because inverter appliances — heat pumps, ERVs with variable-speed compressors, energy-storage and telecom equipment — already run a rectified DC bus at roughly that level; hanging the blower directly on it deletes an entire AC-DC conversion stage. If the unit plugs into the mains and has no DC bus, the EC versions (115/230 V AC, 1,150–1,250 m³/h, 0-6.5 V or 4-speed) are the cleaner fit. Same chassis, same 705 Pa duty.