maximum fans case

1 chassis fan and 1 cpu fan controller. you can hook them up to your power supply though. Or you can buy a splitter similar to this. https://www.newegg.com/Product/Product.aspx?Item=N82E16812162059&cm_re=fan_splitter-_-12-162-059-_-Product

That Asus H110M-K motherboard has a total of only two 4-pin fan headers (1x CPU_FAN, for your CPU cooler; and 1x CHA_FAN, for your chassis fan). https://www.asus.com/Motherboards/H110M-K/specifications/

Since you have 3 pre-installed chassis fans in your case, you have a couple of options on how to power your fans:

Option 1: Using a fan splitter
The fan header of your motherboard is rated at 1A max. You can plug in two or more fans via splitters as long as the total amp draw of all the fans connected to such header will not be more than 75% of the headers rating (or 0.75A), for safety.

Check the back of the fans for the amp draw. It's written there in the sticker label. For example, if your case fans are rated at 0.25A each, then, you can safely connected those 3 fans off that one fan header as it will only draw a total of 0.75A.

You can use a 3-way splitter such as these:

Link 1: https://www.amazon.com/Phobya-Premium-3-Pin-Splitter-Connection/dp/B005EOB6XW
Link 2: https://www.amazon.com/Silverstone-Technology-Sleeved-Splitter-CPF02/dp/B00HJOJS9O

The first link is for DC fans that have 3-pin connectors. The second link is for PWM fans that have 4-pin connectors.

You can also use a "fan hub" (but actually just a 4-way splitter) such as this popular Deepcool "Fan Hub"

https://www.amazon.com/DeepCool-FAN-HUB-Cooler-Powers/dp/B008YD7B0M

Emphasis on checking the total amp draw on the fans before using such splitters/"fan hub".

If the total amp draw of your fans reaches more than 0.75A (for example, if your pre-installed fans are rated at 0.3A, which totals to 0.9A), just plug in two fans using a 2-way splitter for a 0.6A total, such as this: https://www.amazon.com/Splitter-Extension-Sleeving-Connectors-Length/dp/B00C46DX4S and power the remaining fan using Option 2 (via PSU) as described below.

Option 2: Direct connection to the PSU
You can also power the fans directly through the PSU's molex connector cables. This will run the fan at full speed 24/7 and no way of monitoring/controlling the rpm (speed) unlike in the Option 1 above.

This is done by using a 3-pin-to-Molex adapter cable such as this:

https://www.amazon.com/3pin-power-4pin-molex-adapter/dp/B000H25PBK

Note that some pre-installed case fans already comes with a 3-pin AND molex cables (an option for you to choose betwen plugging such fan on your motherboard or plugging it directly to your PSU's molex power cable). Check your pre-installed fans for this if you need to buy such molex adapter for Option 2.

Option 3: Using a dedicated-powered Fan Hub

Unlike the "fan hub" in Option 1, there are fan hubs that are powered by the PSU (so you don't have to worry about the 1A max. rating) but still maintains connection to your motherboard for fan speed control and monitoring.

Usually, these fan hubs are powered using your PSU's SATA power cable, and have more fan connections than a typical splitter:

https://www.amazon.com/SilverStone-System-Cables-Black-CPF04/dp/B00VNW556I

There are several options available and which to use will depend upon the type of fans and type of header.

A. Splitter cables - tend to clutter up your PC with unattractive cables but you may not care if you don't have a side window. Quality of cables is suspect if not from a known reliable source. Hub's are always preferred.

B. DCV Header and 3-pin fans - ModMyToys is the best known supplier and it would be extremely unlikely if your case came with 3 fans that that exceeded the typical 1 amp rating of your header.

$3.99 http://www.performance-pcs.com/modmytoys-3-pin-power-distribution-pcb-3-way-block.html

C. DCV Header and 3-pin fans w/ Power Cable - Useless option as the power cable delivers a 12volt supply which over rides the variable voltage signal from the fan header which is used for speed control.

D. PWM Header and PWM Fans - Here, because the speed control is not based upon variable voltage, you can use a power cable to provide extra power if needed. Again with 3 fans, I don't see this as being needed but check your fan ratings to be sure.

< 1 amp $4.99 no power cable
http://www.performance-pcs.com/modmytoys-4-pin-pwm-power-distribution-pcb-4-way-block.html

> 1 amp $9.95 w/ power cable
http://www.swiftech.com/8-WayPWMsplitter-sata.aspx

E. PWM or DCV Header and either PWM or DCV fans - This is my fav option of the bunch as it gives you the most flexibility and "the best of both worlds" performance wise. The Phanteks Hub gives you control of up to 11 fans from a single header.

$18.19 https://www.newegg.com/Product/Product.aspx?Item=9SIA4RE5032993
Options:

1) Use PWM or DCV header to control up to 1 amps worth of DCV 3 pin fans - Again "best of both worlds scenario" and your likely situation. If fans are 1200 rpm, you likely could connect up to 6 fans w/o overloading the header ... at 1800 rpm I'd expect 4 or 5. Again, check your fan rating. If you do connect the power cable, you will lose speed control if using a DCV header . All the benefits of PWM (low speed control) w/o any of PWM's negative side effects (cost, low speed hum / clicking)

2) Use PWM header to control up to 1 amps worth of PWM 4-pin fans - Same as above but with 4-pin PWM fans and no power cable needed.

3) Use PWM header to control greater than 1 amps worth of PWM 4-pin fans - Same as abovewith 4-pin PWM fans but power cable connected to control up to 11 PWM fans

You'll want to check this against your case and MoBo manuals but I am going to assume that:

-Your case uses 3-pin DCV fans
-Your MoBo has a 4-pin header capable of using either PWM or DCV control ... Many MoBos auto-select, in others, it isselectable in BIOS

If those assumptions are correct, I would set the MoBo header to PWM control and use the Phanteks hub w/o a power cable since I doubt your total amps adds up to 0.5 amps.

If it does exceed 1.0 amp, connect the power cable.

However it will not matter as whatever the case may be with the header or fan type, the Phanteks Hub will be able to handle the test.

Gee guys, thanks for just repeating what I told him.

I don't recommend splitter cables.