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(Cheaper imitations abound on Amazon, but using these may void your warranty.) It would be nice if these secondary filters were available separately, but thats not currently the case

Double Happiness is from China, where it has long been a prestige brand

26-lbs, Activated & Enhanced Carbon Filter (17% Potassium Iodide, 83% Coconut Shell)

The filtration system consists of the fabric pre-filter to catch large particles, the main HEPA filter for pollen, pet dander, and other allergens, and also the activated carbon layer for smoking, cooking, and other odors

It has also helped me make informed judgments on factors such as ease of maintenance and operation, the presence or lack of distracting noises or lights, and simple visual impact the so-called little things that, if done incorrectly, can turn what should be a nearly set-it-and-forget-it appliance into a daily annoyance