Article: Modern air filters much more efficient.(Knight Ridder Newspapers)

Picking an air filter for a furnace or air conditioner has become more complicated in recent years, but it can also be a lot more rewarding.

Some modern filters are much more efficient than others at removing airborne particles, including dust, pollen, pet dander, mold and even smoke. That can mean cleaner air and better conditions for people with allergies or other respiratory problems.

Consumers also need to pay close attention to filter maintenance this year. It is easy to overlook the air filter, which is generally out of sight inside the housing of the furnace or air conditioner, and a dirty, clogged filter can drive up fuel costs by impeding the ...

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