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I was getting the super cheap ones from my building.They were never dirty. I bought my own and I change them when they get dirty (every few months) which varies based on the weather and how often I cook.
I read a couple of articles online on timing regarding changing HVAC filters. The Bob Villa site says once every 3 months (which is what I've been doing). The air filter is 20x25x4. The product guideline says it should last for 12 months. I do have some pretty good allergies and I'm highly allergic to grasses, cedar, mold, and ragweed. I get the one with the Merv rating of 12. I was late one time and changed it at the 4-month mark. There was noticeably more dust on it.
Most pollens are so large that they have a hard time floating in the indoor air. So they have a hard time making it into the return vents to get filtered. The only exception would be if you have a fresh air intake.
Most pollens are so large that they have a hard time floating in the indoor air. So they have a hard time making it into the return vents to get filtered. The only exception would be if you have a fresh air intake.
Most older homes get fresh air from opening the doors to walk in and out and/or from the building envelope leaking.
In newer homes, since they build them tighter ... they put in fresh air intake.
I have a 2002. It leaks, I also open things up and I also have fresh air intake. I had to add room purifiers for during the wildfires. I have a whole house air filtration system too.
The purpose of an air filter in a typical residential house is to protect the HVAC system from damage due to particulates in the air, period. A residential home & HVAC system are not designed to achieve air quality inside the home that is substantially cleaner than air outside the home.
The purpose of an air filter in a typical residential house is to protect the HVAC system from damage due to particulates in the air, period. A residential home & HVAC system are not designed to achieve air quality inside the home that is substantially cleaner than air outside the home.
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