Select the filter according to the flow of the windWe have the formula to save the clean winds needed for salary systemQ = V x AC in thereQ: for clean air flow system (m3/h)A/C: (Air change) the number of air changes/hourV: (Volume) of clean roomEach filter has a record of (capacity). So the number of filters needed = Q/filter flow.For example:We have clean rooms = W x D x H = 5 x 4 x 2 = 40 m3The number of times required change is 25 times/hoursNeed traffic filtering in 1 hour = 40 x 25 = 1000 m 3/h (flow filter should select must be greater than 1000 m 3/h)Size according to standard rough and secondary filter are:KT: 12 "x 24" x thickness = 1700 m3/hKT: 20 "x 24" x thickness = 2800 m3/hKT: 24 "x 24" x thickness = 3400m3/h.So we choose 1 beginner G4 size 12 x 24 x 2 "and 1 secondary filter F8 size 12" x 24 "x 21" mm.Choose if level, 100,000 Class clean is the wind speed in your mouth requires 0.5 m/s, we select the HEPA filter, H13 1219 x 610 x 66 mm in size, flow 1205m3/h or two filter 610 x 610 x 66 603m3/h flowIn the absence of required wind speed, we just choose 1 610 x 610, x150 H13 HEPA, 1305m3/h traffic.The need to pay attention when choosing the HEPA filter: filter = flow cross section x the speed of the wind. If the wind speed required is 0.45 m/s at the mouth to filter the traffic as tandard of filter as follows:The size and standard flow of HEPA filterIf the wind speed is 1 m/s and 2.5 m/s (apply at AHU) then the flow will change. The higher the wind speed, the total cost for the lower filter and vice versa. However in practice it is common to choose the wind speed at the mouth about < 1 m/s. If the higher wind speed itself born dust in the room and the photo to clean level Huong. Type of required wind speed of 0.45 m/s, the initial pressure drop usually < = 150Pa. other types of 250 Pa. influence of initial pressure Drop to longevity, and flow of the filter.
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