![]() ![]() However you can’t just throw the highest merv rated filter you can find into the rack as you can cause issues. If your filter is higher than an 8 then it’s improving the air quality in your home that you’ll breathe. If your filter is lower than an 8 then your lungs are doing the filtering, your filter is protecting the equipment. I can’t find the source but I was once shown a study that equates your lungs to a MERV 8. A 4” thick MERV 13 filter can be less restrictive than a 1” MERV 8. If the filter is the problem, you can look into replacing it with a thicker one, which would let you keep using a high-MERV filter and only change it every 6-12 months. If it happens with a MERV 8 filter, it obviously wasn’t. If switching to MERV 8 keeps the issue away for a month or so, and then switching to 12 causes it to come back, then it was obviously the issue. If the blower isn’t already set to the highest speed, doing that could make it possible for you to use a high-MERV filter. Many furnaces let you adjust the blower speed, which would give you more airflow. ![]() This is much more likely if the filter is 1” thick than if it’s thicker (2” is common, and you can get 4-5”), since thicker filters have much more surface area, which decreases the restriction. High-MERV filters increase the static pressure of your system, and if the ductwork is already marginal, this can cause the airflow to drop to a level where the temperature exceeds the furnace’s limit. Spam: If you think your submission was unfairly caught in the spam filter, message us right away using the " message the moderators" option below so we can quickly remedy it. There's also the HVAC discord that seems like a pretty chill place to hang out, but it isn't affiliated with Reddit. R/construction (for the lols and the hahas) R/airconditioners (window units, wall shakers and all related equipment) R/kitchensuppression (for commercial range hood/restaurant fire suppression) R/airbalance (for Test, Adjust and Balance professionals) R/refrigeration (commercial refrigeration stuff) ![]() R/ProHVACR (questions about owning or operating a HVAC company) R/askanelectrician (for basic electrical questions) R/hvacporn (for those sweet, sexy mechanical rooms and installs) Unlicensed or uncertified work on gas appliances directly affecting the flow of gas/exhaust, examples include: gas pressure adjustments, venting, gas pipe work.Īn immediate ban will result for anyone giving unsafe or dangerous advice.Uncertified refrigerant use (using gauges without proper certifications).Venting refrigerant deliberately or advocating doing so.Untrained work on three phase or electrical voltages higher than 240.Disabling safety systems, even for just a minute to test or because you are very cold.Please do not crosspost to r/hvac or r/thermostats - pick one sub for your post. If you have an electrical question, feel free to ask over at r/askanelectrician ! No advertising is permitted here - as in do not post links to your blog, specific products for sale on other websites, etc. While the mods do their best to make sure information is accurate, you should ALWAYS take internet advice with a grain of salt. If you are experiencing issues with your Heating, Air Conditioning, Ventilation and Refrigeration system PLEASE call a professional. r/HVACadvice exists to offer insight from people who are experienced in the HVAC field. Please refer to the long form version of the rules here.
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