![]() Pressure drop of air filter is composed of two components: filter media and structure of air filter. Tables 4.5, 4.6, 4.7, and 4.8 are four examples of foreign standards. There are several types of HEPA filters, such as folded media-type filter which could be classified as separator HEPA filter and no-separator HEPA filter. ![]() The former is a type of low-pressure drop, which is a patent product of Institute of HVAC of China Academy of Building Research. There are several types of sub-high-efficiency particulate air filters, such as cartridge air filter and folded media-type filter. There are several types of high-efficiency filters, such as bag filter, cartridge air filter, and folded media-type filter. It’s better to choose air filters with larger filtration area. There are several types of roughing air filters and medium-efficiency air filters, such as panel-type air filter, bag air filter, and folded media-type filter. If cleanness class corresponding to 0.1 μm is needed, its efficiency should be tested with particle diameter 0.1 μm and it is called ULPA filter. The purpose is to provide various cleanness classes corresponding to 0.5 μm, while its efficiency is usually tested with particle diameter 0.3 μm. It is mainly used as final filter in cleanroom. It is mainly used to capture submicron particles with diameter less than 1 μm, which is similar as that of high-efficiency filter. It is used as final filter in the cleanroom to obtain a certain class of air cleanness (please refer to 10.1007/978-4-7_7), prefilter for HEPA filter to further improve the cleanness of supply air, and final filter of fresh air system to improve the fresh air quality. ![]() Sub-high-Efficiency Particulate Air Filter. It is mainly used to capture airborne particles with diameter between 1 and 5 μm. It is used as final filter for ordinary cleaning ventilation system and as intermediate filter to protect HEPA filter and improve the cleanness of supply air. It is mainly used to capture airborne particles with diameter between 1 and 10 μm. Since roughing air filter has been placed to filter large particles, medium-efficiency air filter can be used as the final filter in general ventilation system and prefilter for HEPA filter. It is mainly used as prefilter to capture large particles and prevent them from entering the system, especially these airborne particles with diameter larger than 5 μm, settling particles larger than 10 μm and various foreign materials. ![]() There is often some processing time before a refund is posted.Coarse Air Filter. Then contact your credit card company, it may take some time before your refund is officially posted. If you haven’t received a refund yet, first check your bank account again. We will notify you via email should this become the case. In some cases, we may elect to issue a refund without requiring the return of a product. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 3 business days. Once your return is received and inspected, you will receive an email notification that the refund has been approved or declined. After the product is returned, you receive a refund. If your return request is approved and requires shipping, then you receive an email with shipping instructions and a return shipping label. Select a return reason and add a note for the store. If your order has more than one item, then select the items that you want to return.Ĥ. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.ģ. Go back to the online store, and then enter a six-digit verification code.Ģ. Click the order that you want to submit the return for.ģ. In the Email field, enter your email address, and then click Continue.Ģ. Submit a return request Click the profile icon in the store's navigation, or go to the refund policy or a returns page, and then request a return.ġ. It must also be in the original packaging. To be eligible for a return, your item must be unused and in the same condition that you received it. Our returns policy covers items delivered within the last 90 days.
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