Return Fan Section
AssemblyA second plenum fan that pulls air back from the occupied space, overcoming return-duct losses and enabling economizer relief. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Return Fan Section parts and their functions
5 top-level parts · 159 parts in total · full bill of materials below
| # | Part | Qty | What it does |
|---|---|---|---|
| 1 | Plenum Fan Wheel | 1× | A backward-curved aluminum or steel impeller, 315–1,250 mm in diameter, statically and dynamically balanced to grade G6.3. |
| 2 | Fan Motor 5 parts | 1× | A direct-drive induction or EC motor, 1.5–75 kW, mounted on the fan frame with the wheel fitted straight onto its shaft. |
| 3 | Fan Frame | 1× | A welded steel cradle that holds the motor and wheel as one removable module inside the fan section. |
| 4 | Vibration Isolator | 4× | A rubber-in-shear or spring mount under each corner of the fan frame that keeps fan vibration out of the casing and ductwork. |
| 5 | Variable-Frequency Drive 5 parts | 1× | The inverter drive that varies fan speed to track duct static-pressure setpoint, cutting fan power with the cube of speed. |
3D model
No 3D model yet. Have a CAD file of this? Add a 3D model. STL renders right on this page; STEP, FreeCAD, and OpenSCAD sources are welcome too (openly licensed, like all 3D models on BOMwiki).
Build & assembly graph
expand / collapse · shared sub-assemblies converge · links to related products · est. labour
product / assembly
shared across products
atomic part
related product
Tap an assembly to expand/collapse · tap a part to open it · use “Open page” for any node · drag to pan, scroll to zoom.
Bill of materials for Return Fan Section
5 top-level lines · 22 rows shown · 159 parts total · indented to 3 levels| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Plenum Fan Wheel | air-handling-unit-fan-wheel | 1× | 1 | · | part |
| 2 | Fan Motor 5 parts | air-handling-unit-fan-motor | 1× | 1 | 26 | assembly |
| 2.1 | Stator Assembly 3 parts | stator-assembly | 1× | 1 | 3 | assembly |
| 2.1.1 | Stator Core (laminations) | stator-core | 1× | 1 | · | part |
| 2.1.2 | Copper Winding | copper-winding | 1× | 1 | · | part |
| 2.1.3 | Slot Insulation | stator-insulation | 1× | 1 | · | part |
| 2.2 | Rotor Assembly 4 parts | rotor-assembly | 1× | 1 | 19 | assembly |
| 2.2.1 | Rotor Shaft | rotor-shaft | 1× | 1 | · | part |
| 2.2.2 | Rotor Core | rotor-core | 1× | 1 | · | part |
| 2.2.3 | Neodymium Magnet | neodymium-magnet | 16× | 16 | · | part |
| 2.2.4 | Ball Bearing | ball-bearing | 1× | 1 | · | part |
| 2.3 | Copper Winding | copper-winding | 1× | 1 | · | part |
| 2.4 | Motor Housing | motor-housing | 1× | 1 | · | part |
| 2.5 | Ball Bearing | ball-bearing | 2× | 2 | · | part |
| 3 | Fan Frame | air-handling-unit-fan-frame | 1× | 1 | · | part |
| 4 | Vibration Isolator | air-handling-unit-isolator | 4× | 4 | · | part |
| 5 | Variable-Frequency Drive 5 parts | air-handling-unit-vfd | 1× | 1 | 127 | assembly |
| 5.1 | IGBT Power Module | igbt-module | 1× | 1 | · | part |
| 5.2 | Bare PCB | pcb-bare | 1× | 1 | · | part |
| 5.3 | Microcontroller | mcu | 1× | 1 | · | part |
| 5.4 | SMD Passive (R/C/L) | smd-passives | 120× | 120 | · | part |
| 5.5 | Connector | connector | 4× | 4 | · | part |
Something wrong in this list? Report a problem with this BOM.
Where the return fan section is used
1 product across 1 domain contain it, directly or inside a sub-assemblyUsed in 1 assembly
Sourcing: possible vendors
Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work| Vendor | HQ | Specialty | MOQ | Lead time |
|---|---|---|---|---|
|
🇨🇳Foxconn
foxconn.com ↗
|
Shenzhen, CN | Electronics contract mfg | 1,000 pcs | 6–10 wks |
| flex.com ↗ | Singapore | Electronics contract mfg | 1,000 pcs | 6–10 wks |
| dixoninfo.com ↗ | Noida, IN | Electronics contract mfg | 1,000 pcs | 6–10 wks |
| bydelectronic.com ↗ | Shenzhen, CN | Electronics contract mfg | 1,000 pcs | 6–10 wks |
| venture.com.sg ↗ | Singapore | Electronics contract mfg | 1,000 pcs | 6–10 wks |