![]() If the vacuum has a medium setting (not every vacuum does), we test that, too. ![]() To test battery life, we run the cordless vacs on high and then again on low until the battery is depleted, and then note the times. We embed 100 grams of sand into a carpet, then vacuum over it on high speed for 16 strokes using a strobe light to highlight the test area. We note the number of strokes as well as how much fur, if any, is left behind on the carpet or in the brush roll. We embed 1 gram of Maine coon cat hair in a medium-pile carpet and then see how many vacuum strokes it takes to remove it, with a maximum of five. We weigh the vacuum before and after to calculate how much debris was removed. We make four swipes to remove the cereal and rice, and two to pick up the sand. In separate tests, we scatter cereal, rice, and sand on a section of laminate flooring. Average vacs leave behind visible patches or fur becomes entangled in the brush. Vacuums with an excellent rating collect all the fur in the bag or bin. Then they make multiple passes with the test vacuum to see how much of the hair it picks up. First, technicians take 5-gram bags of long fur from Maine coon cats and scatter and embed it into medium-pile carpet. Our testers then run the same vacuum over a medium-pile carpet scattered with an additional 20 grams of wood flour, and measure the air again for released particles due to brush agitation. Technicians fill each vacuum with 50 grams of wood flour and run it with the powerhead off the floor, using a laser spectrometer to measure the particle concentration-down to 0.1 micrometer-released by the bag or the bin into the room. Testing is conducted in a sealed test chamber with controlled environmental conditions. Vacuums are rated on how much suction they maintain and how strong the airflow is relative to other models. The hose of each model is rigged up to a pressure gauge and the level of airflow is measured at three stages: with the vacuum bag or bin empty, with it filled with 100 grams of wood flour, and again with a total of 200 grams of wood flour. The empty vacuum is weighed, passed over the debris field once in both directions, and weighed again to determine how much it sucked up. Test technicians measure out 40 grams of sand and sprinkle it evenly over hard-surface flooring. After a specific series of back-and-forth strokes across the test area in a climate-controlled chamber, the carpet and vacuum are weighed again to determine precisely how much debris was cleaned up. The soiled carpet and vacuum are weighed to get a baseline measurement. ![]() We adapt an industry-standard test to lift 10 grams of surface talc and 90 grams of embedded sand from a medium-pile carpet.
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