Darwin Technology International LTD Early adopters of ifD technology Leading the Industry in Advanced Air Purification

ifD in Trane Clean Effects system:
l to r — filter, field charger, pre-filter

Questions & Answers

Questions & Answers about ifD

How it works

What is particle charging, and why is it necessary? What is diffusion charging? What is field charging? What are the electrical power requirements for an ifD filter? What is the thinnest practical filter depth? Why is ifD pressure drop so low? How does airspeed affect the performance of an ifD filter? Can you predict pressure drop for various ifD configurations?

Questions and Answers

How do ifD and traditional electronic filters differ? How do “electret” filters compare with the ifD system?


Is the ifD filter effective against germs, bacteria, viruses, mold, etc? Do ifD filters reduce odors? What is the effect of heavy cigarette smoke on ifD filter efficiency?

Effectiveness Ratings

Do ifD filters have MERV (Minimum Efficiency Reporting Value) ratings? What is clean air delivery rate (CADR)?

Durability and Maintenance

Do ifD filters fracture or degrade with repeated heating and cooling? What happens if the filter gets wet? How do you clean an ifD filter? How often does an ifD filter need to be cleaned?

Energy and the Environment

What is the power consumption of an ifD filter? How can ifD filters reduce HVAC operating costs? How environmentally friendly is the ifD technology? Does ifD cause ozone?


What is involved in licensing the ifD technology?
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