Air Strainer Selection Experience
◎Rationally determine each level strainer efficiency
Generally speaking, the last degree strainer decide the air purification level, the upper levels strainers only act as protective role, which protects the leeward side strainers and extends their useful life or products air-conditioning system and ensures their normal works.
Air-conditioning design, should first according to user's clean request to determine the strainer last level efficiency, and then select the strainer with protective function, if this level strainers also need to protect, then add strainers in its upwind side. The protective effect strainers referred to as "pre-strainer."
Should be properly matched all levels strainer efficiency. If the adjacent two level strainer efficiency specifications have much difference, then, the previous level will not protect the latter level, if the two levels are similar, the latter burden is too small a.
Clean rooms end high efficient strainer service life should be 5 to 15 years, the most important factor affects the service life is the advantage of pre-strainer good or bad.
When using the "G ~ F ~ H ~ U" efficient size classification, can be easily estimated all levels strainer efficiency. Between G2 ~ H12, every 2 to 4 stalls set up a strainer. For example: G4 → F7 → H10, in which the end of H10 (sub-efficient) strainers determine the clean level of air supply, F7 protects H10, G4 protects F7.
Before the end of high-performance clean room (HEPA) strainer should be efficient specifications not less than F8 strainer to protect; afront ultra-efficient (ULPA) strainers can use F9 ~ H11 strainer. The central air-conditioning should have its own strainers to protect that the efficiency specification is not lower than F5.
In the absence of sand, low-pollution areas, afront F7 strainers may not set up pre-strainer; in the city central air-conditioning systems, G3 ~ F6 are common primary strainers.
What efficiency level of pre-strainers should be set to protect the latter strainer, which requires designers and field engineers decide after the comprehensive consideration of applicable environment, spare parts costs, energy consumption, maintenance costs and other factors.
Examples
●100 level clean room, set up F5 → F8 → H10 → H13 four level strainering, end-H13 Strainers are used for 8 years.
●Before clean room HEPA strainers only have F5 protection, the user should replace the HEPA strainers annually.
● heavily polluted cities new air purification system strainer set is G3 → H10, after two weeks system running, the H10 strainer is scrapped.
● an automobile spray-paint line, the strainer setting is G3 → F6 → F5. Among them, the end F5 is the roof covered strainer material, it only affects as the mean flow from technological requirements; F6 determines the purification level of air supply.
Main Points: the last stage strainer performance must be reliable.
The pre-strainer efficiency and specifications should be reasonable.
The primary strainer maintenance should be easy.
◎strainer selection of typical places
| No. | used places | main strainer efficiency | Common strainer element | Special requirements | Description |
| 1 | main strainer of ordinary central air-conditioning | F5～F7 | Bag, no partition strainers | reasonable strainering efficiency | Public health, protect the interior decorating, and air-conditioning system |
| 2 | pre-strainer of ordinary central air-conditioning | G3～F5 | A variety of cheap, easy to use strainers | High dust capacity, goods supply is guaranteed | Protects air-conditioning system, and latter level strainer |
| 3 | High-grade central air-conditioning in public places | F7 | Bag, no partition strainers | － | To prevent the draft black stain and the interior decoration fade |
| 4 | Airport Terminal | F7 | Bag, no partition strainers | － | The first impression of visitors |
| 5 | schools, kindergartens | F7 | Bag, no partition strainers | fire proof | special safety considerations |
| 6 | consulting room and ward | F7～F8 | Bag, no partition strainers | － | prevent cross-infection |
| 7 | museums, libraries | F7 | Bag, no partition strainers | － | protect treasures |
| 8 | studios | F7 | Bag, no partition strainers | － | protect optical devices and products |
| 9 | 100000,10000 level non-uniform flow clean room | HEPA | with clapboard, non-clapboard HEPA strainer | set by set testing, non-flammable material | Strainers installed in the HEPA outlet |
| 10 | 100 level clean room | HEPA Or ULPA | with clapboard, non-clapboard HEPA strainer | before leaving factory,scan and inspect set by set | clean room end |
| 11 | ordinary clean room pre-strainer | F8～H10 | Bag, no partitions, with partition strainer | － | ensure End-strainer normal service life |
| 12 | Chip plant 10 level, 1 level clean plant | ULPA | No partition strainer | Scan testing, flow evenly, no volatile | the strainer has the highest performance requirements nowadays |
| 13 | Chip plant 10 level, 1 level clean plant pre-strainer | HEPA | no partitions, with partition strainer | high face to face wind speed | Ensure that the end strainer life is "a lifetime" |
| 14 | pharmaceutical industry, 300,000 level clean room | F8～H10 HEPA | Bag, no partitions, with partition strainer | Strainer does not contain nutrients | End-strainer could be set within the central air conditioner |
| 15 | Negative pressure clean room exhaust strainers | HEPA | no partitions, with partition strainer | reliable | 禁止危险物品的排放Prohibiting the discharge of dangerous goods |
| 16 | Car Painting Pipeline main Strainer | G4～F7 | Bag Strainer | Does not contain silicone, lint-free, flame-retardant | meet paint without defects and protect equalize current materials |
| 17 | Car baking paint line main strainer | F6～F7 | High-temperature resistant strainer with clapboard | Does not contain silicone | Process requirements |
| 18 | High demand static spraying producting workshop | F7～F8 | Bag, no partition strainers | Does not contain silicone, lint-free | ensure appearance with no defects |
| 19 | Nuclear power plant exhaust | HEPA | with partitions, no partitions Strainers | Fire proof, impact resistance, specialized certified agencies | - |
| 20 | Use central air-conditioning room, switchboard, middle control room | F5～F7 | Bag, no partition strainers | - | Prevent undesirable heat radiation and electrical fault due to dust |
| 21 | Using tank air conditioning engine room, switchboard, middle control room | G3～F5 | Simple flat strainer | - | Due to space limited, cabinet air conditioner is difficult to use other forms of strainers |
| 22 | Fiber snag process | F8 | bag strainer | - | prevent the broken wire |
| 23 | Spinning workshop | G4～F7 | bag strainer, static strainer | - | prevent the "ash yarn" |
| 24 | food industry | F7 | Bag, no partition strainers | No nutrients | Production environmental health |
| 25 | Clean bench, air shower | HEPA | with partitions, non-partitions HEPA strainer | - | - |
| 26 | Rolling mill main motor | F7 | bag strainer | inflaming retarding | Prevent electrical fault caused by dust |
| 27 | Cigarette factory central air-conditioning | F7 | Self-cleaning filtration equipment, bag strainer | - | The domestic tobacco industry is popular self-cleaning filtration device currently |
| 28 | family central air-conditioning | G3～G4 | Flat Strainer | Cheap, beautiful shape | the goods put at the supermarket |
| 29 | Common household air-conditioning | Nylon mesh strainer | Washable | Blocked fibers and coarse dust | |
| 30 | sand Regional pre-strainer | － | Inertial dedusting device, bath dedusting device, shutter strainer | － | Remove large particles of dust, only work in the windy time |
| 31 | Gas turbine and centrifugal compressor | F7～F8 | No partitions, bag, there is partition strainers, self-cleaning strainer | Shock resistance, fire-retardant | prevent device internal scaling, abrasion, corrosion |
| 32 | Axial compressor | F5～F7 | No partitions, bag strainer | Shock resistance, fire-retardant | prevent the blade wear and tear |
| 33 | Reciprocating air compressors, internal combustion engines | G3～F5 | Bag strainer, clean strainer, flat strainer | Shock resistance, Resistant super-resistance | prevent cylinder wear and tear |
| 34 | Advanced Car Air Conditioning | F7 | No separator strainer element | － | Dustproof, pollenproof |
| 35 | top grade household cleaner | F7 HEPA | No separator strainer element | durable,waterproof | prevent exhaust secondary pollution |
| 36 | Clean room cleaner | HEPA | No separator strainer element | durable,waterproof | prevent exhaust secondary pollution |
| 37 | household air purifier | F7～F9 HEPA | Tube-shaped and square no partitions strainer elements | cheap,beautiful shape | the goods at the supermarket |
| 38 | gas mask | HEPA | No separator strainer element | temperature-resistance, waterproof | Often used in combination with activated carbon |
Note: The "main strainer" means the last level strainer, or designated parts strainers.
