Make sure to turn off the furnace and/or HVAC system before opening it. [2] X Research source
If you are unsure whether your filter is dirty, hold it up to the light, and look through it. If you cannot see the light, the filter is dirty and needs to be replaced. A dirty filter will circulate dirt and dust through your home instead of usable, clean air and will force your furnace to work harder to push air through the grime. If your filter is not disposable, it must be cleaned. First remove any dirt or loose particles. Generally, a mild soap and tap water can then be used to rinse and wash the filter. [4] X Research source Make sure to let the filter dry thoroughly before putting it back in the furnace. Many furnaces use a disposable filter. If this applies to yours, take the old filter to a hardware or appliance store (or record the size and/or model number), and purchase a replacement filter of the same type or model.
If the filter doesn’t seem to fit properly, make sure that no dirt or debris is blocking it. If you have a new filter that doesn’t seem to fit right, double-check that you purchased the correct type or size.
You can wrap a small piece of tape around each wire and label it, to make reassembly easier—just make sure to remove the tape labels before reattaching the wires to the blower fan. Some fans are held in by screws or bolts; remove these with a screwdriver or ratchet in order to take the fan out. Keep the screws or bolts in a safe place so you won’t lose them before you are ready to put the fan back.
The blower assembly is the component that pulls air in through the back of the furnace, pushes it out of the front, and creates the heat. If the blower assembly is dirty, your furnace will push dust and dirt out through the vent system of your home. Thus, it is very important to clean the assembly well.
Remember to plug your furnace back in and turn it on after cleaning the fan blower assembly.
Remember to plug your furnace back in and turn it on once you have finished cleaning and vacuuming the heat exchanger block.
