Air purifiers with negative-ion technology often have standard filters, such as the Alen BreatheSmart 75i, which also comes with a HEPA filter and an activated-carbon filter. A potential downside ...

The size of the room best suited for the air purifier based on Consumer ... and clean or replace its filter(s). About Overall score for the Alen Breathsmart is mainly how well the model removed ...

In the last edition of Don’t Fear the Filter, we built up two examples of the simplest and most-used active filter of all time: the two-pole Sallen-Key lowpass. This time, we’re going to put ...

The HEPA filter should be replaced every 12 months. While all of the filters for the Alen BreatheSmart 45i Air Purifier are medical-grade H13 HEPA air filters that capture 99.9% of harmful ...

where smoke particles can compromise indoor air quality. By trapping airborne particles in their filters, air purifiers ...

Unlock to see our ratings and compare products side by side Dust, pollen, smoke removal is how well a model cleared air of fine clay ... About Overall score for the Alen T500 Pure + Black is ...

The best units can remove a wide range of both particles and gases; they use technology like HEPA (high-efficiency particulate air) filters to remove small particles and activated carbon filters ...

Find out about Allen Millyard's approach to custom bike building here in his new column for MCN - why he aims for a factory ...

An important one is cleaning and maintaining your car’s air filter. This filter is important because it allows air to combine with your fuel to cause combustion and power the engine. If the ...

(Jeff Allen/) Accessing and changing the air filter is quick, easy, and doesn’t require tools. A Twin Air air filter comes ...

(Jeff Allen/) Behind the Twin Air air filter is an airboot with a reed valve system that decreases engine noise. (Jeff Allen/ ...

These models can help clear harmful particulates. Plus, other steps you can take to improve indoor air quality.Left to right: ...