Dust, pollen, smoke removal is how well a model cleared air of fine clay dust and cigarette smoke when operating at its highest speed. A model that scores well for dust removal should perform ...

NPR has previously posted a design and guide to building an air purifying cube known as a Corsi-Rosenthal Box, using four 20-inch MERV 13 filters, a 20-inch box fan and two 20-inch panels of ...

MERV 13-20 is typically found in hospital and ... which makes them about three times more expensive than standard-size filters you can buy at big box stores. When you’re changing filters four ...

Overall score for the Aprilaire 213 Merv 13 is mainly how well the model removed dust and smoke from a test chamber and airflow resistance for whole-house units. Dust/pollen/smoke removal ...

NPR has previously posted a design and guide to building an air purifying cube known as a Corsi-Rosenthal Box, using four 20-inch MERV 13 filters, a 20-inch box fan and two 20-inch panels of ...