In addition to HEPA, you’ll additionally see activated charcoal or carbon filters on our record. Carbon is efficient in eradicating smoke particles, gasses, and odors from the air—simply word that, whereas these purifiers could pack an additional punch, they’ll possible include a better price ticket.
Cost of filter replacements
Because purifiers require a filter change each 3 to 12 months (the time-frame varies by model and the way usually you run your gadget), you’ll wish to contemplate the price of new filters on prime of the machine’s price. Each model has its personal sort of HEPA filter, and so they all come at completely different costs—some manufacturers even supply a subscription low cost for scheduled refills.
Room measurement
“It’s important to consider the size of the room when choosing a purifier,” says Mehrotra. “The filtration process can vary from product to product, but the goal of air purification is about five or six air-changes per hour in the room, a rate that is sufficient to decrease particle levels in the room by about 70%.”
One technique to gauge the effectiveness of a air purifier is the product’s CADR, or Clean Air Delivery Rate—a measurement developed by the Association of Home (*8*) Manufacturers (AHAM) within the Eighties. “CADR measures the amount of particle-free air being delivered into the room,” explains Mehrotra. “It reflects both how effective the filter is and the amount of air going through the filter. The higher the clean air delivery rate, the larger the size room that can be properly cleaned.”
Mehrotra provides {that a} good CADR ranking is the same as no less than two-thirds of the room’s space in sq. toes. For instance, a room that measures 10 toes by 15 toes has an space of 150 sq. toes. For this room, an excellent CADR ranking could be no less than 100 cubic toes per minute (cfm).