How to select an axial flow fan?

You first have the area; multiplying it by the height of the factory building gives you the volume. Multiplying the number of times ventilation is needed by this volume yields the total air volume required. Dividing this total air volume among the number of fans determines the air volume per fan. The fan model is then selected based on this per-fan air volume. If the fans are to be installed on the roof, there’s no need to consider wind pressure issues; however, if ducts are used, wind pressure must be taken into account. Calculating wind pressure is rather complicated. Hehe

I’d like to add a few points that I hope will be helpful to the original poster: Calculation of the standard number of air changes per hour: Locations – Times per hour: Assembly plants………………12; Halls…………………15; Factories (general ventilation)…… 8; Factories (fume extraction)…………20; Gyms………………10; Saunas……………40; Dance halls………………10; Beauty salons………………12; Bakeries………………30; Theaters………………10; Laundries………………15; Meeting rooms………………10; Ceramic factories………………15; Foundries………………25; Churches…………………10; Glass factories………………12; Kitchens…………………20; Paper mills………………10; Offices………………10; Shops (general ventilation)………8; Toilets…………………15; Warehouses…………………12; Electroplating plants………………20; Libraries………………20. Air volume required per hour for humans and animals: m3/h – Children…………………45; Women……………… 69.6; Men…………………84; Cattle and animals………………228; Chickens…………………19.8. As can be seen, there are two ways to calculate the total number of air changes: one is based on the type of location, determining how many times air needs to be changed per hour； Another method is to determine the total amount of air based on the amount of air that a person needs to exchange per hour; the poster can choose whichever method they prefer. 1. Determine the number of fans required based on the number of people in the room: Air exchange rate × number of people ÷ fan capacity = number of fans. 2. Determine the number of fans needed based on the number of air exchanges per hour in the room: Volume of the room × exchanges/hour ÷ fan capacity = number of fans. The above are just basic principles; for specific design considerations, please consult professional fan specialists.

Workshop length × width × height × air change rate ÷ number of fans installed = fan-induced air exchange volume. Select one value from the selected range of fan air volume options that is greater than the \"fan ventilation volume\" calculated above. From an economic perspective, it is sufficient to choose the value that is greater than the smallest value among the \"fan ventilation volumes\".

I’d like to add that if there are large numbers of heat sources in the workshop and the temperature is high, it is also necessary to calculate the heat balance to determine whether the required temperature drop is achieved.

I have some clues now; thank you all for your help. I’m not sure in which manual I can find this information!

Some of the information mentioned above comes from books, while some is the result of years of personal experience. If you are interested in fans, you can look for materials related to them. Here are a few books that you might find useful: 1. Title: Industrial Ventilation (3rd Edition); Author: Sun Yijian, Editor-in-Chief. 2. Title: Engineering Design Methods for Axial Flow Fans; Authors: Wu Bingli, Li Wenzhou. 3. Title: Fan Product Catalogs (Volume 1 and Volume 2); Authors: Sun Yan and others. Additionally, there are websites dedicated to fans as well, which you can visit for more information.