Cleanroom engineering tool

FFU electricity cost calculator

Estimate how much electricity your fan filter units use and what it may cost to run them. Enter the power per FFU, quantity, operating schedule, and electricity price.

Energy cost uses the electricity price you enter.

Estimate operating cost

Results update as you type.

Enter your FFU and tariff details

FFU equipment

Electrical input power per FFU

Use power at the intended operating speed.

Number of FFUs Enter a whole number of units.

Operating schedule

Operating hours per dayMore than 0 and up to 24 hours.

Operating days per year1–366 whole days.

Electricity rate

Price per kWhEnter your local energy price.

Currency labelFor example USD, EUR, or CNY; no exchange conversion.

This estimate assumes the entered power and electricity price stay constant during the scheduled operating hours. It covers FFU electricity only.

Estimated electricity cost

Enter the FFU power, quantity, schedule, and electricity price.

Build your estimate

01Enter the electrical input power and FFU count.
02Add operating hours and days per year.
03Enter the electricity price per kWh.

Worked example

20 FFUs × 150 W · 12 h/day · 300 days/year · USD 0.15/kWh

10,800 kWh/year → USD 1,620/year

Calculation usedAnnual cost = combined FFU power (kW) × hours/day × days/year × price/kWh

How the estimate works

Electrical energy is power multiplied by operating time. Express the combined FFU input power in kilowatts, multiply by the scheduled hours, then multiply energy use in kWh by the electricity price per kWh.

Combined power (kW) = power per FFU (kW) × FFU count

Annual energy (kWh) = combined power (kW) × hours/day × days/year

Annual cost = annual energy (kWh) × price per kWh

For example, 20 FFUs drawing 150 W each have a combined input power of 3 kW. At 12 hours per day for 300 days, they use 10,800 kWh per year. At USD 0.15/kWh, the estimated annual electricity cost is USD 1,620. These numbers illustrate the arithmetic, not a standard FFU specification or tariff.

What this estimate includes

The result covers FFU electrical input at a constant power draw and a single energy price. Actual FFU power can differ at other speed settings, airflow rates, pressure conditions, and filter states. A measured or supplier-confirmed power value at the intended operating point will make the estimate more useful.

Use the total electrical input per FFU, including its fan and controls where those are part of the stated unit power.
If the FFUs have different speeds or schedules, calculate each group separately and add the results.
Demand charges, time-of-use tariffs, taxes, maintenance, cooling load, and other cleanroom equipment are outside this estimate.

Discuss your FFU project

Source notes: The U.S. Department of Energy energy guide explains power × time and kWh-based cost. Lawrence Berkeley National Laboratory discusses how FFU energy performance varies with operating conditions.