We have tested a dust filter that combines the best features of plastic and nylon filters. It has high mechanical resistance, is easy to clean and yet also has low restrictiveness, so it does not significantly change the sound of the fan and does not increase its noise level. Compared to plastic filters, it does not even “hiss”. This addition thus extends the database of results with the latest type of dust filter, one with a metal grille.
Sound colour
| Type of obstacle | Dominant sound freq. and noise level, Noctua NF-A12x25 PWM@7 V | NF-F12 PWM | NF-A15 PWM | ||||
| Low range | Mid range | High range | |||||
| Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | ||
| Metal dust filter | 195,8 | -74,1 | 339,0 | -72,4 | 19330,5 | -90,8 | |
| Silon (20 den) on the circular grille | Nylons + circular grille, 15 den | 127,0 | -69,2 | 369,7 | -72,0 | 17726,2 | -90,8 |
| Silon (40 den) on the circular grille | 127,0 | -69,5 | 369,7 | -71,9 | 19330,5 | -90,9 | |
| Foam dust filter | 195,8 | -74,6 | 339,0 | -75,9 | 19330,5 | -90,8 | |
| Hexagonal grille | 127,0 | -77,8 | 339,0 | -69,1 | 1974,0 | -89,8 | |
| Circular grille | 20,3 | -76,4 | 201,6 | -69,4 | 18780,2 | -90,9 | |
| Plastic dust filter | 127,0 | -68,6 | 339,0 | -74,3 | 5583,4 | -89,1 | |
| Nylon dust filter | 195,8 | -63,3 | 201,6 | -62,8 | 1974,0 | -90,5 | |
| No obstacle | 130,7 | -77,3 | 339,0 | -74,3 | 1974,0 | -90,4 |
