Fans are used for pushing cooling air through electronics enclosures. They often fail after a few years. Sometimes when one fails it causes a breakdown. So they are worth keeping on hand. Most Common Characteristics Type - Axial - Box - Circular - Centrifugal Power Supply - 12Vdc - 24Vdc - 24Vac - 230Vac Size - 40mm Square - 60mm Square - 80mm Square - 90mm Square - 120mm Square Depth - 10mm - 20mm - 25mm - 38mm - 50mm Frame Material - Plastic - Metal Bearing Type - Maglev - Ball Bearing Connection Method - Prongs - Leads - 2 - 3 Flow rate - in CFM - or m3/h Common Fans used in specific jobs What Box fans should we keep on hand? _ | 12Vdc | 24Vdc | 24Vac | 48Vdc | 115Vac | 230Vac | 415Vac ---- | --- | --- | --- | --- | --- | --- | --- 40mm | Yes | | | | | | 60mm | Yes | Yes | | | | | 80mm | | Yes | | | | | 90mm | | | | | | Yes | 120mm | | Yes | | | | Yes | Manufacturers - [EBM-Papst](https://www.ebmpapst.com/au/en/home.html) - [Sunon](https://www.sunon.com/en/) Suppliers - E14 - RS - Jaycar - Altronics - Mouser - Digikey Common Fans Model | Type | Size | Manufacturer | Supplier | Notes ----- | ---- | ---- | ------------ | -------- | ----- 4650N | Box | 120x120x38 | [EBM-Papst](https://www.ebmpapst.com/de/en/products/compact-fans/axial-compact-fans/p/4650N.html) | [RS:](https://au.rs-online.com/web/p/axial-fans/1018052)