Resistance. Where as in an electrical circuit there are resistors that restrict the flow of electricity
Outside. Anything you do to the inside will restrict air flow.
You should be able to, but make sure that the sand filter with the slower flow rate is on top to make sure that the other filter does not overflow. If you place the faster flow rated filter first then slowly the slower one will fill and eventually overflow.
One a dam, and two a filter
A filter drier for a cooling only condensing unit will have an arrow pointing in one direction. This is because the refrigerant that passes through it will always flow in the same direction. A heat pump filter drier must have the ability to allow the refrigerant to flow through it in either direction and so a filter drier that is made for a heat pump will have two arrows pointing in opposite directions.
the arrow points in the direction of air flow.
If you have been using a pleated filter for a long time, 2-8 years plus, with no problem, then you are keeping your coil clean so stay with a pleated filter with the same Merv rating. If you have a metal or plastic electrostatic filter that you are washing, then you should change it to a pleated filter. You can never get the electrostatic filter clean enough and they restrict your air flow when they get dirty which will cause your electric bill to increase.
At the bottem right hand side facing the furnace you will find a filter. This is one of the commen filters you can buy at Walmarts. The filter is a cardbord sheet with a filter on it. Pull out said filter look at the size printed on it.Go to Walmart and buy another. When you push in said filter be sure the air flow arrow on top edge is pointing toward the furnace.
Toward the direction of the air flow. In other words the air is being drawn into the furnace so the arrow should point at the furnace.
Use a filter with fiberglass filter element like Wix or Delco, no cheap filter with a cardboard filter meduim, Not only do they do a lesser filtering job they restrict oil flow. If you are asking for a part number, best suggestion is call dealer.
The same reason you replace the filter in your home furnace. They can become clogged with lint, dirt and reduce the air flow.
16 x 20
It could , but it would have to be almost plugged totally , to restrict the fuel flow that it was starving the engine . You could very well have another problem , but fuel filters can get very dirty and restrict fuel flow.
It can plug up and restrict the flow of fuel to the point where the engine cannot run properly, if at all.
It can plug up and restrict the flow of fuel causing the engine to run poorly, if at all.
Arrow on filter toward furnace or inline with air flow.