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Some motors have brushes, some don't, some have RPM controls, some dont, but in all cases, if a motor shaft is restricted from turning, it amounts to more current drawn, and as previously noted, less cooling too, in both cases, shortening the life of the motor and raising your electric bill. An example would be something like this. The other possibility is that you may have filters at your return vents doing a majority of the air filtering, and the filter at the blower is simply redundant. How the Furnace Switch Works . Is the energy of an orbital dependent on temperature? Is it more efficient to send a fleet of generation ships or one massive one? Are there any gambits where I HAVE to decline? To learn more, see our tips on writing great answers. Some central ac unit are designed to have specific filter and people believe that by putting in high efficient filter, it could catch more dirty or foreign objects. We also offer custom size filters. So it is backwards from what most people think. Most home central HVAC systems have disposable filters that can be thrown away when dirty and replaced with a new one. Thanks for contributing an answer to Home Improvement Stack Exchange! The large metal furnace compartment contains a filter and blower. Answer: Furnace manufacturers put inexpensive fiberglass filters into their furnaces to remove airborne particles that might damage the fan and the heating coil. This filter will be changed at. When it comes to furnace filters, the rule of thumb for many HVAC professionals is “the cheaper the better.” lowering/raising the ambient temperature. When there is not enough airflow through the evaporator the suction pressure is below normal because the refrigerant flowing through the evaporator picks up less heat than normal resulting in lower pressures. Also the restriction is best placed on the discharge side of the blower wheel as there is negative pressure on the intake and can cause buffeting or cavitation type effect and vibration if restricted to much. Always consult your owner’s manual before changing your air filter. I have what seems to be a return vent in every bedroom that don't have filters and one large return vent that does. Furnace Efficiency. Change the furnace filters at least every three months. If that is the case, the best course of action is to have an HVAC professional come to your home and do an evaluation. The boobs who installed the furnaces in my complex did this -- they probably had an overstock of 2" boxes or filters they unloaded on us. I do have two return ducts that do have filters. It's definitely not going to improve flow. In your situation, a good quality passive filter is likely to be satisfactory unless you have allergies and need a microparticle filter. My question is, does this degrade the filter in any way? Call a professional HVAC expert to inspect your HVAC system. Vacuum around the area where the filter sits and make sure you don’t see black particles or debris in the air 3. This circuit is served by its own circuit breaker in the breaker box (properly called the main service panel).The circuit wiring runs from the service panel to the disconnect switch, and from there to the furnace. http://hvacrfundamentals.blogspot.com/2009/08/understanding-centrifugal-fan-motor.html, https://yorkcentraltechtalk.wordpress.com/2012/09/11/what-is-an-ecm-motor/, https://yorkcentraltechtalk.wordpress.com/2012/07/20/air-flow-effects-on-air-conditioning-revisited/, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…. The air filter moves around too much inside the filter housing slot. (Keep reading to see why. It seems you have a better understanding of the theory and not the practical applications and you have failed to understand the simple thermodynamics of a central air system. You'd be much better off resolving the reason why you have Pet hair in you unit. At the top is an electronic filter. If your furnace has speed control, it is likely a D/C motor. Inveniturne participium futuri activi in ablativo absoluto? However, a lot of houses do have more than one HVAC unit, which means they’ll be at least one air filter per unit that you need to be able to locate. The outside air temp. When was the last time you changed your air conditioner’s filter? What harm, if any, does it do if it’s backwards? In some cases, this moisture can transfer to the air filter … The EPA says that basic mechanical air filters may not be very good at completely removing particulates. Otherwise the gas is colourless and odorless. Under normal conditions, your filter should last at least a month and gradually become clogged with grey-colored dust and debris. Most AC and HVAC units use standard sized filters, but some do require a custom size air filter. Will a furnace run without a filter? For example, a MERV 8 filter could last up to three months in one circumstance but a MERV 13 filter would last for one to two months in the same scenario. The same thing will happen if you have a super clogged up old filter. Adding an extra filter would make them more so unless the other filter was removed and the new one was less restrictive. cold/clammy. I HAVE A RHEEM 2 1/2 TON (30 k btu ) everything is working fine gets cold air (but very cold and clammy) need to run at 71-70-69-68- depends on the outside temp to make temp comfortable in the house. That filter has an … Which direction should axle lock nuts face? Airflow issues are among the most common HVAC problems. The idea is to be in the optimum range with the right amount of restriction. These generally run in roughly the $50-$100 range and have a 10 yr to lifetime warranty. Horizontal HVAC unit - Furnace filter will be located on the intake side, slid into a rack. Most HVAC technicians recommend changing 1-inch air filters every 30 days, while 4-inch filters can be changed every 3–6 months. The cheap, 1-inch (2.54-centimeter) thick, disposable filters made of jumbled fiberglass or natural fiber strands typically have a MERV rating of 1 but can go up to 4. (3) https://yorkcentraltechtalk.wordpress.com/2012/07/20/air-flow-effects-on-air-conditioning-revisited/. Go Back Why a Cheap Furnace Filter Could be Your Best Option. The kludge suggested by my furnace guy (not the banana who put the system in) was to either use two 1" filters, or a 1" filter and some spacers. The lower the CFM the more the heat the blower unit generates and this reduces life on the blower as well (1). Pleated filters made of nonwoven, disposable fabric have smaller pores, and the pleats increase the surface area of the filter so it can hold more particles than a flat surface can. There is a common misconception about restriction and the load on the motor and the restricting flow. These filters are made from polyester or paper material. I have an all electric house. There's another approach that doesn't require multiple filters or replacing filters, and that's to use a permanent filter. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. I have a Bryant indoor unit it has 2 slots for a filter it’s says put the 1 inch filter on the top slot and remove divider for a 2” filter when I put the 1” filter in the top slot there’s a 2” gap from where the top filter is so air is coming through the opening is this ok The drawback is that they are expensive to put in. The main purpose of a furnace filter is to protect the blower fan from all the dust, hair and other gunk the return duct pulls in. The cheap, 1-inch (2.54-centimeter) thick, disposable filters made of jumbled fiberglass or natural fiber strands typically have a MERV rating of 1 but can go up to 4. I added that filter in the odor unit thus causing the air handler to run longer and in this case more efficient, If you can use 2 then use two and rotate and throw out first filter and add new one behind older filter as often as you need too. It will absolutely draw more current than in the normal operation the motor was designed for, the coils heat up, eventually the motor burns out. Two interpretations of implication in categorical logic? Ramifications of adding a second HVAC air return (in parallel)? As always you can try it and see. Some filters are supposed to last for just 30 days, while others might say they can go 3 months without needing to be changed.

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