How to Install NZXT F140X and F240X Fans in Your Case

Quick answer

Install the F140X as a standard 140mm case fan and the F240X as a single-frame 240mm unit, but decide airflow direction before you screw anything in. Mount intake fans at the front or bottom with the frame's airflow arrow pointing into the case, and exhaust fans at the top or rear with the arrow pointing out. Route one cable per fan or per frame to a motherboard header or NZXT controller, then test spin and lighting before closing the panel.

The F140X and F240X look similar in a product photo, but they mount differently. The F140X is a single 140mm fan that goes in one set of screw holes. The F240X is a single-frame unit with integrated fans, so it occupies a 240mm span and uses one cable for speed and lighting control.

That difference changes your installation order. You need to confirm clearance, airflow direction, and header or controller availability before the first screw goes in. The steps below walk through both fans, with checkpoints for the mistakes that most often cause weak airflow or a fan that never spins.

Before you start: clearance and header check

Measure the mounting location before you remove any panels. A 140mm fan needs a 140mm fan mount, while a 240mm single-frame unit needs a 240mm span with enough depth for the frame and its cable exit. If you are replacing an existing fan, compare the old fan's mounting pattern to the new one rather than assuming the holes line up.

Count your available connections. Each F140X needs a fan header for speed control, and the F240X needs a connection for its integrated fans plus a path to an NZXT controller for lighting and speed control if you want software control. The F240X's single-frame design means one cable handles the whole unit, which simplifies routing but also means you cannot split its fans across two headers.

• Checkpoint: if a 240mm mount is partially blocked by a drive cage or cable bar, resolve that before mounting the F240X.
• Keep the fan's airflow arrow visible during the dry fit so you do not have to remove it later.

Step 1: Set airflow direction before mounting

Every fan has a small arrow on the frame that shows the direction air moves. Decide whether the position is intake or exhaust first, then orient the fan so the arrow points the correct way. Front and bottom positions are usually intake; top and rear positions are usually exhaust. Getting this wrong is the most common reason a build runs warmer after a fan upgrade.

For the F240X, the single-frame design means all integrated fans share one orientation, so you cannot flip one fan independently. Confirm the arrow direction on the frame before you commit, because rotating the whole unit later means removing every screw.

• Common mistake: installing a fan because the logo faces outward instead of checking the airflow arrow.
• Checkpoint: with the fan held in place, trace the arrow direction and confirm it matches your intended intake or exhaust plan.

Step 2: Mount the F140X in a 140mm position

Hold the F140X against the mount and align its four screw holes with the case's threaded holes or slots. Start all four screws by hand before tightening any of them. This lets the frame settle into position and prevents cross-threading, which is easy to do on painted steel or soft aluminum.

Tighten the screws in a diagonal pattern, a little at a time, until the frame is snug. Do not overtighten. The goal is to stop vibration, not to compress the frame. If the fan sits against a filter or mesh, make sure the blades are not contacting anything before you move on.

• Checkpoint: spin the blades with a finger after mounting. They should rotate freely with no scraping.
• If the mount uses long slots, center the fan so air is not leaking around one edge.

Step 3: Mount the F240X as a single frame

The F240X installs as one unit, so treat it like a single large component rather than two separate fans. Align the frame's mounting holes with the 240mm span, start all screws by hand, then tighten diagonally. Because the frame is longer, support it with one hand while you start the first screw so it does not shift and strip a hole.

Plan the cable exit before final tightening. The F240X routes lighting and speed through a single cable to an NZXT controller, so leave enough slack to reach the controller without pulling the frame out of alignment. If the cable is trapped between the frame and the case, loosen the screws, reposition the cable, and retighten.

• Common mistake: tightening one end of the frame fully before the other end is aligned, which bows the frame.
• Checkpoint: confirm the frame sits flush against the mounting surface with no gaps that would let air bypass the fans.

Step 4: Connect power and lighting

Connect each F140X to a fan header for speed control. If you want lighting control on an F240X, connect its single cable to an NZXT controller, which is sold separately. The controller handles both lighting and speed for the integrated fans, so you do not need to run a separate cable for each fan in the frame.

Before closing the case, power on and confirm every fan spins. If a fan does not spin, check the header connection first, then the header's setting in BIOS or your control software. A fan connected to a header set to zero RPM or a disabled fan curve will sit still even when it is installed correctly.

• Checkpoint: verify lighting and speed control in software before you reinstall the side panel.
• If you run out of headers, a controller is the cleaner solution than daisy-chaining mismatched fans.

Step 5: Cable routing and final test

Route fan cables behind the motherboard tray where possible and secure them with the case's tie-down points. Keep cables away from fan blades and from the path of airflow. On the F240X, the single cable is easier to manage than multiple fan cables, but it still needs a clean path to the controller.

Close the case, power on, and listen. A correctly mounted fan should produce airflow noise, not rattling or scraping. If you hear contact, power down and check that no cable or filter is touching the blades. Then run a short load test and confirm temperatures are stable or improved compared with your previous setup.

• Common mistake: leaving a fan cable loose enough to drift into the blades over time.
• Checkpoint: after 10 minutes of load, feel the exhaust airflow to confirm direction and strength.

Installation steps at a glance

1. Confirm clearance and headers: Measure the 140mm or 240mm mount and count available fan headers or controller ports before removing panels. Checkpoint: resolve blocked mounts or missing headers before you start.
2. Set airflow direction: Use the arrow on the frame to orient intake fans inward and exhaust fans outward before mounting. Common mistake: mounting by logo orientation instead of the airflow arrow.
3. Mount the fan or frame: Start all screws by hand, then tighten diagonally until snug. Support the F240X frame while starting the first screw. Checkpoint: blades spin freely with no scraping.
4. Connect power and lighting: Connect the F140X to a fan header. Connect the F240X's single cable to an NZXT controller for lighting and speed control. Checkpoint: confirm spin and lighting before closing the case.
5. Route cables and test: Secure cables away from blades, close the case, and run a short load test to confirm airflow and temperatures. If you hear rattling, power down and check for cable or filter contact.

Product facts that affect installation

• F140X: The NZXT Performance Fans deliver powerful, quiet cooling with LCP construction, optimized blades, and a hybrid bearing system for superior airflow and durability. The LCP frame and blades resist flex at high speed, so the fan stays stable when you mount it in a high-airflow position and run it at higher RPM.
• F240 RGB Core: NZXT F Series RGB Core single-frame fans seamlessly integrate multiple fans for effortless installation while offering superior cooling, whisper-quiet performance, and striking RGB visuals. Because the fans are integrated into one frame, you mount and cable one unit instead of two separate fans, which saves time and reduces cable clutter.
• F240 RGB Core: Simply connect a single cable to an NZXT controller (sold separately) for lighting and speed control. Plan for an NZXT controller before installation if you want software control, since the frame does not provide separate per-fan cables.

The F140X and F240X reward a little planning before the first screw. Decide airflow direction, confirm your headers or controller, and tighten diagonally. Do that, and both fans install cleanly and run the way they should.