A 2000 sq. ft. Type II dry-cleaning system shall be provided with an exhaust no less than how many CFM?

A 2000 sq. ft. Type II dry-cleaning system shall be provided with an exhaust no less than how many CFM?

• A. 1000 CFM
• B. 2000 CFM
• C. 3000 CFM
• D. 4000 CFM

Answer: (B)

In a Type II dry-cleaning setup, the ventilation requirement is focused on providing enough air to dilute and remove solvent vapors effectively. The standard often uses a straightforward rule: the minimum exhaust flow equals the floor area in square feet, so you get about 1 CFM per ft^2 of space. For a 2000 ft^2 area, that means an exhaust of 2000 CFM. To see why this makes sense, think of the room’s volume. If the ceiling is about 8 ft high, the space is roughly 16,000 ft^3. At 2000 CFM, you’re moving 120,000 ft^3 of air each hour, which works out to about 7.5 air changes per hour. That level of ventilation helps keep solvent vapor concentrations from rising toward hazardous levels, balancing effective vapor control with reasonable operating costs. Higher exhaust rates would provide more dilution but aren’t required by this rule, and lower rates could let vapors accumulate. So for a 2000 ft^2 space, the minimum is 2000 CFM.

In a Type II dry-cleaning setup, the ventilation requirement is focused on providing enough air to dilute and remove solvent vapors effectively. The standard often uses a straightforward rule: the minimum exhaust flow equals the floor area in square feet, so you get about 1 CFM per ft^2 of space. For a 2000 ft^2 area, that means an exhaust of 2000 CFM.

To see why this makes sense, think of the room’s volume. If the ceiling is about 8 ft high, the space is roughly 16,000 ft^3. At 2000 CFM, you’re moving 120,000 ft^3 of air each hour, which works out to about 7.5 air changes per hour. That level of ventilation helps keep solvent vapor concentrations from rising toward hazardous levels, balancing effective vapor control with reasonable operating costs.

Higher exhaust rates would provide more dilution but aren’t required by this rule, and lower rates could let vapors accumulate. So for a 2000 ft^2 space, the minimum is 2000 CFM.