Final answer:
The minimum CFM for an exhaust fan in a 2000 square foot house could be estimated at 2000 CFM based on the HVI's general recommendation of 1 CFM per square foot; however, the exact requirement will depend on various factors and local building codes.
Step-by-step explanation:
The minimum amount of CFM (Cubic Feet per Minute) needed for an exhaust fan in a 2000 square foot house is not provided in the question but is often based on a few factors including air changes per hour (ACH), the size and layout of the house, and specific local building codes. Usually, the Home Ventilating Institute (HVI) recommends 1 CFM per square foot of living space as a general rule, so one might infer that approximately 2000 CFM would be required for a 2000 square foot house. Ventilation requirements can vary, and it is important to consult local building codes or a professional to determine the precise exhaust fan CFM needed.