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Most fiberglass spun filters, such as those found in your local grocery store, are usually only a MERV 1 or MERV 2. This can affect the efficiency and air flow of your heating and cooling system, causing it to work harder to produce the same air flow, while costing you more money

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Retrieved January 24, 2023

Homes with pets, smokers, or family members with allergies may need more frequent filter changes, regardless of type

This personal importation law is part of why English footballers can use tobacco and nicotine products without legal issues