GRERON 66900399
#27 in Ceiling-hungFull review
Sized for a two-car garage or mid-size shop, rated to 510 CFM.
Amazon $149.99$149.99
The GRERON 66900399 is the better shop air filter overall, rated 3.1 to 3.0. The GRERON 66900399 leads on value. The GRERON 66900399 costs $41.21 less ($149.99 vs $191.20).
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
PURISYSTEMS PuriCare 500
#31 in Ceiling-hungFull review
Sized for a one-car garage or small hobby shop, rated to 500 CFM.
Amazon $191.20$191.20
Which should you buy?
- Choose the GRERON 66900399 for value ($0.29 per CFM ($149.99) vs $0.38 per CFM ($191.20)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every ceiling-hung shop air filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | GRERON 66900399 | PURISYSTEMS PuriCare 500 |
|---|---|---|
| Overall rating | 3.1/5 | 3.0/5 |
| Value 25% | 58 $0.29 per CFM ($149.99) | 45 $0.38 per CFM ($191.20) |
| Airflow 25% | 19 510 CFM at top speed | 18 500 CFM at top speed |
| Filtration 20% | 57 inner filter rated to 1 micron | 50 filter rating not published (neutral score used) |
| Features 20% | 80 remote control, timer, three or more speeds | 80 remote control, timer, three or more speeds |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| GRERON 66900399 | PURISYSTEMS PuriCare 500 | |
|---|---|---|
| Airflow | ||
| Airflow | 250 to 510 CFM | 350 to 500 CFM |
| Speeds | 10 | 3 |
| Room size covered | - | 500 sq ft |
| Filtration | ||
| Inner filter rating | 1 micron, 2-stage | - |
| Built-in ionizer | - | No |
| Features | ||
| Remote control | Yes | Yes |
| Timer | Up to 4 h | Up to 6 h |