Build your own Quad Filter!
Learn More about Quad Filters My take on this 4-filter design is called the Model-B. You can buy it as a kit or build a modified version yourself with minimal tools. I will have a video out soon on the whole build process. Until then have a look at the printable assembly guide and find out more about quad filters in general in my video below…
Assembly Process Video The Model-B kit and the DIY version need some assembly. This video covers fan installation for the DIY version in detail. Feel free to jump to the 5 minute mark for everything you need to know.
Filter Performance Charts
More charts and data coming soon!
In order to get a good baseline for the DIY filters I tested 4 professional HEPA filters. These filters are considered undersized for the 2 car garage with high ceilings where they were tested, but I think it’s helpful to know what to expect from a HEPA filter in a worst case scenario. All these purifiers are more expensive to purchase and operate than the DIY options.
More data coming soon!
LINKS to FILTERS and FANS
BUY the DIY MODEL-B Kit HERE
Choose from a basic kit with filter clips and foam seals or the full kit with fan mounts and wheels.
See all the options on my Etsy Listing
FANs (For all versions):
Enclosed Motor Caterpillar (1400cfm) https://amzn.to/3TD9NM3
Lasko 20in Box Fan (1000cfm): https://amzn.to/3c3nVNF
Pelonis (Dial on the front) (1000cfm): https://amzn.to/4ctlsqr
Air King 20in Box Fan (best Corsi-Rosenthal performance): https://amzn.to/3Tbzl1O
AC Infinity Cloudlift 12in and 14in: https://amzn.to/4cvXBq8
12in iPower Inline Duct Fan (1060cfm): https://amzn.to/3x9tKDZ
8in iPower Inline Duct Fan (750cfm): https://amzn.to/4akSDLL
12in AC Infinity Inline Duct Fan (1604cfm): https://amzn.to/43zuQov
8in AC Infinity Inline Duct Fan (807cfm): https://amzn.to/3vqo480
MERV 14 FILTERs (best small particle capture):
Nordic Pure 20x20x1 (12 PACK): https://amzn.to/3O6GGgr
Nordic Pure 20x20x1 (6 PACK): https://amzn.to/3o5Ge7E
Nordic Pure 20x20x4 (1 PACK): https://amzn.to/3AYyiwC
3M Filtrete 20x20x1(2 pack): https://amzn.to/3duBAxY
Nordic Pure 16x20x1 (12 PACK): https://amzn.to/3MqxJ1c
Nordic Pure 16x20x1 (6 PACK): https://amzn.to/3Oy9NLg
3M Filtrete 16x20x1 (2 PACK): https://amzn.to/3fsenNQ
MERV 13 FILTERs (almost the best small particle capture):
3M Filtrete 20x20x1 (4 PACK): https://amzn.to/3c5wZlu
Filter Buy 20x20x1 (4 PACK): https://amzn.to/3wdtCjk
3M Filtrete 16x20x1 (4 PACK): https://amzn.to/3RjkH7B
AIRx 16x20x1 (9 PACK): https://amzn.to/3S4y8Zt
MERV 12 FILTERs (good small particle capture):
Nordic Pure 20x20x1 (6 Pack): https://amzn.to/3O6HaTN
Nordic Pure 20x20x4 (1 PACK): https://amzn.to/3crRhpm
3M Filtrete 16x20x1 (4 PACK): https://amzn.to/3y2vgW6
Nordic Pure 16x20x1 (6 PACK): https://amzn.to/3D3M2GY
MERV 11 FILTERs (minimal small particle filtration):
K&N Washable everlasting filter 20x20x1 (1 PACK): https://amzn.to/3e9MDNn
Aerostar 20x20x1 (6 PACK): https://amzn.to/3q9Z0M4
K&N Washable everlasting filter 20x20x1 (1 PACK): https://amzn.to/3Vq7oWv
K&N Washable everlasting filter 16x20x1 (1 PACK): https://amzn.to/3Vq7oWv
3M Filtrete 16x20x1 (4 PACK): https://amzn.to/3TFlnH8
Filterbuy 16x20x1 (4 PACK): https://amzn.to/3g8Diqe
DIGITAL ANEMOMETER (use one of these to test your air):
For testing wind speed https://amzn.to/3OkzmhF