It is also recommended that the carbon filter is installed at least six metres from the cooking surface.Ī: Dwell Time, otherwise known as residence time, is how long the air is in contact with the carbon as it passes through the filter. If an air handling unit is already present, it may already have one or more stages of dust filtration.įor a kitchen extract, we recommend that grease filtration is included in the extract canopy and we include a grease filter in our Katercarb units. Anything smaller than 1 micron is likely to need a HEPA filter. The type of dust filter(s) will depend on the dust loading and particle size distribution.
Q: Do I need a prefilter and, if so, what sort?Ī: Activated carbon needs to be protected from ingress of particulates, so prefiltration is recommended if there is particle dust in the incoming air. HEPA filters may be installed downstream of the carbon cells, which will not have a significant effect on sub-micron particles. If more than one grade of dust filtration is present, dust filters are usually arranged from coarsest to finest.
Q: Which way round does the filter unit need to be installed?Ī: The prefilters should be upstream of the carbon cells, i.e. Frequently asked questions – Activated Carbon Filters
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