CULTIVATIONTIPS FUNGIPOINT Spore filters
More than ever before, we are now aware of the threat posed by invisible enemies. The application of appropriate protocols and hygiene measures can help us prevent these threats or stop them spreading further. In respect of mushroom growing, this threat is primarily undesirable spores (and the vectors that spread them, such as sciarids), which can damage the mushrooms.
In addition to correct work protocols and hygiene measures, the incoming fresh air must be filtered. A coarsely woven filter cloth can trap particles of 10 μm or larger, which is sufficient to exclude sciarids, but is totally inadequate to trap any spores present in the vicinity of a mushroom farm. These spores measure from 4 to 10 μm, so they can only be trapped by a fine filter. A fine filter can trap particles from 3 μm, so it is efficient enough to stop harmful spores too.
Fine filters for mushroom growing are usually applied in the form of compact filters or filter cassettes. The usual standard measurement is 600*600 mm with a depth of 300 mm. Fine filter cassettes are available with various efficiencies and classifications. On mushroom farms F7 or F8 filters are generally used, while for composting tunnels F9 fil- ter cassettes are used (a higher F value indicates a higher percentage of trapped spores).
Consequences of using a 3400 m3/h filter cassette in a system designed for 4250 m3
By Jan Gielen
General Manager FungiPoint Specialist climate & energy
FungiPoint@outlook.com
Photo: FungiPoint /h.
There are various companies that supply fine filter cassettes of the above dimensions and filter classifications. However, a number of other factors are also important in this cate- gory too!
The first is the nominal air volume flow of the filter. There are usually has two variants: 3400 m4
/h and 4250 m3 based on 4250 m3 handling a nominal capacity of 3400 m3
/h. Clearly if the number of filter cassettes in the installation is /h per filter cassette, you cannot use filter cassettes only capable of /h! The photo shows the consequences of using
the wrong type. As a general guideline, you should take into account that, in an extreme situation, up to a maximum of 2000 m3 growing surface.
/h of fresh air could be needed per 100 m2 of
The other factors are the initial resistance of the filter (depending on the manufacturer/ filter type this can be 100-150 Pa) and the final resistance - the resistance value at which the filter needs to be replaced - (depending on the manufacturer/ filter type this can be 250-450 Pa). The filter resistance affects the required fan energy requirement. As the filter becomes soiled with accumulated particles, the resistance increases. When the final resistance indicated by the manufacturer is reached, the filter should be replaced.
The only way to determine the correct moment to replace the fine filter is to use a pres- sure meter to measure the differential pressure over the filter with a fully open air inlet.
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