The present invention concerns a method for dimensioning a particulate filterintended for an exhaust system for a combustion engine.

Using the method according to the invention, it is possible to dimension a silicon dioxide fiber filter so that a filtering efficiency of at least 99% is achieved.

The present invention concerns a method for dimensioning a particulate filterintended for an exhaust system for a combustion engine.

Using the method according to the invention, it is possible to dimension a silicon dioxide fiber filter so that a filtering efficiency of at least 99% is achieved.

The filter assembly includes a filter supporting a filter.

A method and apparatus for dimensioning and, optionally, weighing an object.

A digital filter includes a pre-filter cascaded to a low pass filter.

The filter includes a filter support and a filter element mounted on the filter support.

A filter (16) filters fuel.

The sand filter system may include a mini bio- sand filter, a foam filter, or a pressed block filter.

A first polyphase filter filters real digital samples and a second filters imaginary digital samples.

The technique may utilize a vent screen assembly having a main screen, a vent screen, and a tubular member extending from the main screen to the vent screen.

Each filter set (6) comprises a red filter, a blue filter, and a transparent filter.

A filter cartridge in a filter-in-filter design with an inner filter and an outer filter.

A variable optical filter is disclosed including a bandpass filter and a blocking filter.