Axial flow fan installation standards

Use the area and multiply it by the height of the building to get the volume. Multiply the number of times ventilation is needed by this volume to obtain the total air volume required. Divide the total air volume among the number of fans to find the air volume per fan, and then select the fans based on this value. If the fans are to be installed on the roof, there is no need to consider wind pressure; however, if ducts are used, wind pressure must be taken into account. Calculation of the standard number of air changes: Times per hour by location – Assembly plants………………12; Halls…………………15; Factories (general ventilation)…… 8; Factories (fume extraction)…………20; Gyms………………10; Saunas……………40; Dance halls………………10; Beauty salons………………12; Bakers’ shops………………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 factories………………20; Libraries………………20. Air volume required per hour for humans and animals: m3/h – Children…………………45; Women……………… 69.6; Men…………………84; Cattle and horses………………228; Chickens…………………19.8. As can be seen, there are two methods for calculating 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 volume 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 airflow volume = number of fans. 2. Determine the number of fans needed based on the air exchange rate in the room: Volume of the room × exchanges per hour ÷ fan airflow volume = number of fans. The above are just basic principles; for specific design considerations, please consult professional fan specialists.