Sealed cabinet passive air intakes.

[Rhyno]

Hello and thanks for taking time to look at this. My question is this, I am building a sealed cabinet that has a volume of 25 cubic feet. I have purchase a 120mm fan that flows at 85 cfm. I am figuring that this fan will exchange the cabinets air twice a minute after adding 20% for the flow loss from using a carbon scrubber that I am going to build. What I am wondering is since this is going to be a sealed cabinet and I am planning on using passive intake(s) with 90's would it be best to use four(4) 1" holes or possibly two(2) 2" holes? Is there a ratio regarding intake size versus exhaust size for sealed cabinets? I spent a few hours yesterday searching for information on this without any luck. Any insight you can share regarding this is appreciated.

 

[Mr. Hugeblunts]

I don't think you are actually building a sealed cabinet; sealed means no exhaust/intake.

However, your intake surface area should be double the exhaust surface area (area of the hole)

 

[TheMonarch]

Ventilation 101

 

[Rhyno]

Thank you very much for the link. I don't know why I didn't come across this yesterday. It is exactly what I was looking for.

Namste

 

[FreezerBoy]

You want two 120 mm intakes for a single 120 mm exhaust.

While the example uses 9, four 1 inch holes do not come close to equaling one 4" hole.

 

[ScrubNinja]

I find this link helpful for calculating the areas if you want to use different sized holes.