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Zalman MS800 airflow help

Solution
I wouldn't say that it is a bad case because of the front face being all filters. It has 2 + 1 optionnal 120mm exhaust fans so this case is of the negative pressure type, but don't worry, the air flows trough. You can add a 120mm maybe even a 140mm intake fan at the bottom but in my case the wires comming from the PSU prevent me from doing so.
I wouldn't say that it is a bad case because of the front face being all filters. It has 2 + 1 optionnal 120mm exhaust fans so this case is of the negative pressure type, but don't worry, the air flows trough. You can add a 120mm maybe even a 140mm intake fan at the bottom but in my case the wires comming from the PSU prevent me from doing so.
 
Solution
Yakuba your advice is good but here is what I did....

I mounted two 120mm fans, I litteraly got double sided sticky foam tape (square cut) and they hold up in the front no worries.
 
See, airflow. Modification, by whatever means necessary, can make all the difference in the world. Having negative pressure airflow is fine and great if there are only exhaust fans, but without a good supply of airflow being brought in, which generally requires at LEAST one front intake, the exhaust fans will struggle to bring air in by way of pressure differential only. Of course, much depends on what the system is being used for and the degree to which the case is "sealed" too.

On a mostly stock system that will not be

1. Using a high TDP processor
2. Overclocking of anything
3. Running a high end graphics card

the need for cooling will be much less necessary and even a single rear fan and single front fan is likely to be sufficient. If it's a low enough TDP system, even just a rear exhaust is usually good enough so long as there is plenty of entry points for air to get in at the front/bottom of the case and preferably with at least some kind of venting or grillwork up top to allow passive dispersion of heat by way of radiant exchange.
 


It is a great idea! I put some 140 fans at the front held with wires for a while, put I wanna try the sticky foam and see. Right now I use 2 140mm fans exhaust on top + a 140mm at the the bottom as intake in addition to the stock rear exhaust. I use a CPU cooler 202 evo with push/pull configuration. My idle temp is about 38~40 and while gaming it goes up to 68. My 4690k CPU is overcloked and I have a R9 290 GPU. But as darkbreeze says, I wonder if many fans really help in the end. It also helps to route as much as possible wires close from the side panel, even tough the space in this case is pretty narrow. I ended up leaving a chunk of wire hanging on top of a drive. What about your temps?