How to Clean a Floor or Box Fan

In the midst of the summer heat, I’ve always got a floor fan (or two) going in my garage gym. Lately, as I’ve gone to switch it on, I’ve thought, “Dang, that’s really dirty . . . how the heck do you clean this thing?”

I decided to find out and get this job done. Below I’ll share the process, should you need to tackle this chore yourself. It’s an easy one to put off, but dust buildup doesn’t just look bad — it hampers performance, spreads allergens, and can shorten the life of the fan. 

Here’s how to restore a box or floor fan to prime condition (the process is the same for both types).

Tools & Supplies

Phillips-head screwdriverVacuum with brush attachment or handheld vacMild dish soapBucket or large basinMicrofiber cloths or old towelsOptional: Compressed air or a can of air duster

Step 1: Unplug It

This should go without saying, but don’t be the guy who gets zapped trying to clean an electric fan while it’s still plugged in. Unplug the fan and move it to a well-lit area — preferably outside or onto an old towel indoors.

Step 2: Remove the Front Grill

Most floor or box fans are held together with a few screws and/or tabs on the back or sides. Use your screwdriver to unscrew the screws, placing them in a small cup so you don’t lose them. If there are also tabs that latch the front grill on, gently pry them apart. Don’t brute-force it — broken tabs mean a loose grill that rattles forever.

Step 3: Hose Down the Front Grill

Look at that gunk.

Hose it on down.

Step 4: Vacuum the Back Grill

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