![]() If you compare same size/thickness filter pressure drop tables at MERV 8 and MERV 13, the values are hardly different…when CLEAN. Will MERV 13 filters work with your central air system?ĩ9% chance the answer is yes, but you will need to replace them more frequently than lower rated filters. That being said, be prepared to invest a bunch of money into a part of your house that you never even think about thinking about. The most common solution to TESP issues is *gasp* fixing shitty ductwork! Adding supply and return runs, replacing sections of trunk that are undersized or 'just barely' 's pricey, but it's the way to make it work. However! It's important to note that a basic static pressure test can determine suitability for something like an IQair perfect 16 system - if you're got the loot and the physical space for that monster filter box. Most (I find 75-80%) can't handle higher drop filter systems without damaging effects to the blower. Residential HVAC systems can most certainly be retrofitted with HEPA grade air filtration, though careful consideration must be paid to the blower, and total external static pressure of the duct system. ECM stands for Electronically Commutated Motor, though. Your information about blower motors is correct. We do quite a bit of residential IAQ, too. We have resolved air quality issues in operating rooms, food processing facilities, ultra-high-efficiency office spaces with minimal air exchange.the list goes on. My company installs a lot of high end air purification products. I would like to add to this, but in selective favor of high MERV filters. anything higher than a MERV 8 would put too much stress on my system as w hen dirty, that 0.22 pressure drop across the filter is almost half the 0.5 inch of water rating of my furnace's heating mode. per its data sheets (when clean!) it has a static pressure of 0.152, and i have measured it again after 6 months of use and it was dirty, and it measured 0.22 inches of water. you can look at the data sheets of any furnace with an ECM motor and there will be a table that shows power draw vs static pressure and the power draw increased very sharply after you get past 0.6-0.7 inches of water. ![]() the older motors also draw a lot more power at high pressure and so you are just wasting energy. ![]() the newer ECM motors draw less power than older motors but they can draw quite a lot if the pressure is too high as they will actually adjust their RPM based on feedback data. the ECM motors can generally handle higher static pressures, but the older motors tend to overheat and wear out sooner. now, depending on the furnace, it will have one of two types of motor, it will have an ECM (electronically controlled motor) or it will have an old school motor. this is both bad for the furnace can can trip the temperature sensors, but it causes premature wear on the heat exchangers AND causes additional heat to go up the exhaust that otherwise is not sent out into the house in heating mode too little air flow can cause the furnace to get too hot. if too little air flow is moving trough the coil, the coil will actually start to form ice and can severely damage your equipment. this not only makes the furnace work order which we will get to, but it makes it less efficient, especially in cooling mode as less air volume is moving through it. If you run your furnace with too much static pressure several things happen Generally speaking nearly all residential all furnaces are rated to work at a MAXIMUM of 1.0 inches of water of static pressure, and MOST especially in heating mode do not like to run over 0.5 inches of water. These things increase the static pressure and can exceed what the furnace is rated for. Now, if you get a larger MERV 13, 14 or higher, then the filter is harder to pull air through and will get EVEN harder to pull air through as it gets clogged. ![]() supply duct size, if they are small, it is harder to push air back into the houseĪs stated, if the filtration on the furnace is insufficient then too much dust will gather on the coil, clogging it (and also leading to mold).return duct size, if they are small, it is harder to pull air back into the furnace.Now, there are a couple of things that dictate the static pressure of your system These two pressures are then added together to indicate the total of the two pressure forces that the fan has to push and pull against. Total external static pressure is the total of pressures taken where air enters the equipment-or suction pressure (–)-and where air exits the equipment-or discharge pressure (+). the coils will be wet from the condensate and that will cause dust to collect, clogging your AC coil.Īlso remember that furnaces have a rating called "hvac total external static pressure" it is to prevent contamination into the furnace. The air filter on the furnace is NOT meant to clean the air in your house.
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