We test new and outdated machines. When retesting our existing air-purifier picks, we choose four measurements—two using the outdated filters and two working with new filters—to learn the way (or although) their overall performance changed after a while. Where it falls down even so is sounds — it created 36.8dB https://freebookmarkpost.com/story16858582/detailed-notes-on-holmes-360-air-purifier