Where should return and supply vents be located?
For optimal comfort, supply registers need to be installed on outer walls and under windows, whereas return registers are ideally located on inside walls.
What is the best location for HVAC ducts?
Air Ducts Near the Ceiling Are Most Effective
This makes the air circulation less effective and may cause the entire HVAC system to work harder than it needs to. Additionally, vents placed near the floor are at a greater risk of being clogged with dust or other debris.
Where should ducts be located?
Ducts should always be located within the conditioned envelope of the building, ideally within the framing of floors, ceilings and walls, and they should be maintained so air does not leak out of or into them.
If you have an Air Return is on the upper wall I like to slant the louvers upwards so that floor traffic does not view into the duct opening. That is the same with Supply vents as well IF you have adequate air flow and few cold or hot spots in the room from inadequate air flow or distribution.
Return air vents are generally located near the center of the homes. Older and newer homes often have one register per floor, but homes built from 1960-1990 may have a cold return air vent in each room.
Generally speaking, you should only need one return air vent per room in your home. However, you may need additional air vents for larger sized rooms.
You can identify return vents by turning on the system fan and holding your hand or a piece of paper up. If the paper is pulled toward the vent or you feel a suction effect, it's a return vent.
Supply ducts carry conditioned (heated or cooled) air into your rooms, while return ducts suck conditioned air back into the heating or cooling system through vents. Can an air return be too big? No, an air return cannot be too big, except in extreme cases where a closed room is temporarily under negative air pressure.
While it is a myth that air return grilles are required in each and every room in the house, it is definitely necessary to have more than one of these grilles installed at strategic places in the house. Likewise, you can also install these in rooms that have a high footfall or usage in the house.
If there is not enough return air available, your HVAC system will not heat or cool properly. If not enough air is brought back, your HVAC system will not be able to keep up with temperature demands. In some cases, two returns may be necessary to provide enough return air.
Diffuser Placement – The maximum recommended distance between diffusers is three diffuser lengths. For example, if the diffuser length is 4 feet (1.219 m), the maximum separation distance would be 4 ft x 3 = 12ft (1.219 m x 3 = 3.658 m).
Supply register vents should be in every room as well. Located on the outer walls, under windows, in the ceiling, or on the floor, placement depends on the heating or cooling system as well as the construction of the home. Supply vents help change the room temperature to your desired heat or cool setting.
There is no proper direction for the vanes to point. If they're high sidewall, normally they would be pointed upward which makes them vision proof and just the opposite for low sidewall. Frankly the more open you can leave them the better for system operation. The last thing you would want is to restrict is return air.
A second return duct can lower static pressure if the airflow bottleneck is on the return side. If the static is on the supply side, adding a second return will do nothing. So it's usually a good idea.
As the weather gets warmer in the summer, your upper return vents should be open and your lower return vents should be closed. This will allow the cold air to circulate around your home and hot air to be drawn through your return registers.
Should return ducts be larger than supply? Yes, return ducts are usually larger than supply ducts to ensure that air within the home is balanced. There are generally more supply vents in the system creating the need for return vents to be larger.
A 3-ton heat pump has approximately 1200 CFM of air flow. To calculate the filter grill size, divide the airflow, (CFM), by 2. One filter grill or the total area of all grills must equal at least 600 square inches of area to adequately supply the system with the air needed to operate.
x 25-in. Return grilles are the best choice for a five-ton system in order to deliver 2,000 cfm back to the blower without causing the return to hemorrhage.
So, in a nutshell, it recycles air from each room in your home. Warm air travels through a specific set of ducts (called a supply duct), and once cooled down, it travels back to the vents through another set of ducts (called a return duct).
A return air venting system can be installed in one of two ways: either every room with a supply register will also have a return air vent, or there can be centrally located return vents on each floor of your home.
Your AC system should have a proper fitting filter on the return side. By placing a good fitting, high quality filter on the return vent, you will remove particles from the air before they can enter the AC system. A good filter will keep your air handling unit, coils, and ducts clean.
When you close the air vents in unused rooms, it's much easier for the heat exchanger to crack, which can release deadly carbon monoxide into the home. Make sure you have a carbon monoxide detector installed in your home, and keep those air vents open.
Having two air return vents allows you to seasonally control which air is returning to the HVAC system. The theory is that in the Summer cooling season, you want to be circulating warmer air back through the HVAC system to be cooled.
In a heating climate, the return duct goes near the floor to draw off the cold air and heat it up. Also you should have return air ducts on each story of the house. The basement one should be on the floor, not the ceiling of the basement.
Each bedroom needs either: A return air grille ducted back to the furnace; A through-the-wall transfer grille connecting the bedroom and the adjacent hallway; or. A crossover duct (a jumper duct) connecting a ceiling grille in the bedroom with a ceiling grille in the hallway.
Most people would tell you, no, you cannot put furniture in front of an air return vent. For example, you can't place a couch or chair or any piece of furniture that has a back into it in front of a return air vent because it will block all airflow into the return air vent.
To put it as simply as I can, return air vents suck air from the rooms in your house in order to return it back to the heating and cooling system through your ductwork. It is then heated or cooled once again before being pushed back into your house to make you comfortable.
Consequences. Restricting the airflow in the air handler or blower contributes to premature system problems, which can be serious. In the heating cycle, blocked cold air returns can cause the heat exchanger inside the blower compartment to store too much heat and eventually crack.
Ceiling Ducts for Cooling
Because cool air naturally sinks, ceiling ducts are preferable where air conditioning takes precedence. Cool air supplied through floor ducts, conversely, tends to settle near the floor until airflow volume fills the entirely space sufficiently to lower the temperature.