免费风量计算器
计算暖通空调系统的风量（CFM），用于通风设计。
ft
ft
ft
ACH
所需风量
240 CFM
房间体积2,400 cu ft
Required Airflow vs Room Length
公式
## Air Flow Rate (CFM) **CFM = Room Volume x ACH / 60** ACH (Air Changes per Hour) is how many times the entire room volume is replaced with fresh or conditioned air in one hour. Divide by 60 to convert from cubic feet per hour to cubic feet per minute.
计算示例
20 x 15 ft room with 8-ft ceilings at 6 ACH.
- 01Volume = 20 x 15 x 8 = 2,400 cu ft
- 02CFM = 2,400 x 6 / 60 = 240 CFM
常见问题
What ACH values are typical?
Homes: 4-6 ACH for general ventilation. Kitchens: 15-20 ACH. Bathrooms: 8-10 ACH. Workshops: 10-15 ACH. These are guidelines; check local codes.
Is CFM the same for heating and cooling?
Cooling typically requires about 400 CFM per ton of cooling. Heating airflow depends on the furnace type and temperature rise, usually 350-400 CFM per 12,000 BTU/hr.
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