TL;DR:

1. Open 11 screws.
2. Remove the cap on the buzzer.
3. Done.

The Cascade Personal Fan has a very loud beep. I disabled the beep by removing the cap from the buzzer. I am documenting my steps because in my quest, I saw a lot of people with the same issue.

We got a 2-pack from Costco and while the fan is very quiet, the beep is quite loud. Seems like everyone else has the same issue with this fan. All we need is a number 3 Philips screwdriver.

The box

There are two of them in the pack (because of course, it's Costco):

One fan

First, we start with these four screws in the back.

Four screws in the back

We can see the control board:

Back opened

We need to remove another three screws:

Closer look at the top

Can't really remove the connection with the board screwed to the top. We need to remove four more screws:

Top detached

A closer look at the board (open the image in a new tab for a larger view):

Control board

On the back of the board, we see:

• Home Star international Ltd
• 25400640000 V002

Back of the board

We see a Piezo buzzer (I had to Google the type) marked with ZLFY. Looking around the internet, it seems like many household items use these buzzers and a lot of people are annoyed with the sounds. I saw guides on how to remove these buzzers for many items.

Buzzer

The second result for searching ZLFY is the datasheet. It appears to be a ZLFY ZL-YDW12055-4005PA-7.5:

• https://lcsc.com/product-detail/Buzzers_ZLFY-ZL-YDW12055-4005PA-7-5_C219730.html

I used a flathead screwdriver to pop the buzzer cap:

Buzzer's cap

Having given away my soldering kit before the move, I was thinking I needed to unsolder the buzzer but the cap was actually easy to remove:

Buzzer's cap is a moved a bit

And done:

Cap removed

Enjoy no beeps and add Hardware Hacking to your resume /s.