What type/size of fan for my enclosure?

[blapcb]

add a fan to enclosure

I am building an enclosure for some electronic equipment (made of sheet metal) and am planning to add a fan (fans?) for cooling. I guess the type of fans would be DC Axial fans, but I am wondering about the size, flow ratings etc. Also, should the air blow in or be taken out?

In the enclosure there would be a motherboard, a DCDC ATX supply, a 100-150W ACDC supply etc.

Thanks

 

[cameo_2007]

size can be of 4 Inches,which i think will be suitable for your application.
hot air is normally blown outside from the chasis,or else you will be blowing all the extrnal dusts in to your system,if taken inside.

 

[Ok elec box]

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[kak111]

Thermal Management
Fan/Blower Selection (Sizing)
https://www.newark.com/pdfs/techarticles/hoffman/thermalManagementForEnclosures.pdf

**broken link removed**

Air blow into case, better if filter used in front of blower,
take care also air-exhaust so that air distributed throughout where the cooling needed.
If motherboard has "hot points" , add smaller inside blower for it.