Mod Quạt Ly Tâm 120MM cho CPAP

A mod that allows you to use a 120MM fan for CPAP. This mod cost me ~$30 USD. 

Update: Some users seemed to have have issues with a small gap once printed. I made an adjusted come to hopefully help solve this issue

!!! IMPORTANT NOTE !!! This mod was designed to use the cuff of a CPAP tube which has an ID of 22mm. So as a result, the OD of the cones top is also 21mm. Do NOT cut off the cuff of your CPAP tube or you wont be able to use this mod

Why is the Cone so long? Well, it follows an important HVAC rule of thumb which is: Don't narrow a duct by more than 11 degrees measures wall vs opposite wall. This ensures that the cone doesn't throttle airflow by narrowing the path to quickly.

Why are there holes in the CPAP Cone Holder? Just to reduce filament waste and print times. Though some may prefer the rigidity.

Comment on this model if you have any issues, and I will try to fix it.

Bill Of Materials:

Name

Amount

My Source:

M5 T-Nut

2

https://a.co/d/bKw5OyA

M3x8 Socket Cap Bolt

3

https://boltdepot.com/Product-Details?product=6379

M5x8 Socket Cap Bolt

2

https://boltdepot.com/Product-Details?product=6406

M5x10 Socket Cap Bolt

3

https://boltdepot.com/Product-Details?product=6407

120MM Centrifugal Fan

1

https://a.co/d/ifqRSyT

15MM Diameter CPAP Hose with a 22MM ID Tube Cuff

1

https://a.co/d/dWVqJlY

Assembly Instructions:

1. place the two M5 T-Nuts into the 2020 aluminum extrusion matching the top holes of the Cpap Cone Holder. 
2. Screw in the two M5x8 Socket Cap Bolt to secure the Cpap Cone Holder
3. place the 120MM Centrifugal Fan at the bottom of the Cpap Cone Holder and use the three M5x10 Socket Cap Bolts to screw the fan into place.
4. Place the Cpap Cone onto the 120MM Centrifugal Fan and use the three M3x8 Socket Cap Bolt to secure the Cone to the Cpap Cone Holder.
5. Attach the 15MM Diameter CPAP Hose with a 21MM ID Tube Cuff to the Cpap Cone