They are disposable pleated filtering cells at medium gravimetric efficiency and they are composed of a nonwoven reinforced cotton fiber media supported on the air leaving side with a metal grid and boxed into a strong die cut cardboard frame. The pleating according to which the grid and media are fitted ensures a real filtering surface by two times (for filters having 23 mm thickness) to six times (for filters having 98 mm thickness) higher than the frontal surface of the cell.
Applications
They are used either as final filters or as pre-filters to filters having higher efficiency (like LOM-BAG pockets filters, V-cell filters or activated carbon filters) in ventilation and air treatment units, when it is necessary to combine good air flows with reduced passage sections.
Features
These filters have an ISO Coarse 60% filtration efficiency according to EN ISO 16890 (G4 according to EN779:2012). The shape of the pleating ensures minimal resistance to airflow associated with a high accumulation of dust for the entire operating life of the filter.
On request they can also be supplied with ISO ePM10 55% filtration class (M5 according to EN779:2012).
The table below shows the capacities and the pertaining initial resistance for the standard sizes:
| Dimensions [mm] | Capacity [m³/h] | Pressure drop [Pa] | Capacity [m³/h] | Pressure drop [Pa] | ||||
| sp. 23 | sp. 48 | sp. 98 | sp. 23 | sp. 48 | sp. 98 | |||
| 400 x 500 | 1840 | 100 | 60 | 55 | 2380 | n.a | 80 | 75 |
| 400 x 625 | 2400 | 2980 | ||||||
| 500 x 500 | 2400 | 2980 | ||||||
| 500 x 625 | 2980 | 3650 | ||||||
| 595 x 595 | 3400 | 4240 | ||||||
| 287 x 595 | 1700 | 2120 | ||||||
The limit working temperature is 90°C approx.
The DP filtering cells can be supplied with different dimensions from the standard above ones.
For heavy applications or in environments with high humidity, they can also be supplied with a metal frame.
Installation & service
The DP filters can be installed into C-shaped guides or into holding frames at frontal access. These filters are not washable, replace the cells once having reached a resistance of 200÷250 Pa.