Can you split an air duct?

Splitting a duct will reduce the efficiency of conditioning that space. You will need to know if the HVAC system has enough CFM Flow for the addition to begin with. Ideally it would be best to run a line direct from the main box coming from the HVAC unit.

How do I run duct to the second floor?





Quote from the video:
Quote from Youtube video: Cut out your trunk. Notice I put some duct tape so I don't cut my arms. And then add the top take off you can add that from underneath you feed it from the top over notice I got some flex.

Can you have two vents one duct?

Well, you can’t! You’d often blow air from one bathroom into the other, and local building inspectors wouldn’t approve it. But while you can’t have two fans with one vent, you can make one fan and one vent serve two bathrooms.

What happens if there is not enough return air?

If there is not enough return air available, your HVAC system will not heat or cool properly. They must be properly sized — Return air ducts must be large enough to carry a sufficient amount of expended air back to your furnace, air conditioner, or heat pump.

Can you run ductwork between floor joists?

A: Yes, you can bore relatively large holes through I-joists to run refrigerant lines, pipes and ducts. This is preferable to running the lines under the joists and then covering them with a dropped ceiling, or installing drywall over thin lumber fastened to the bottom of the joists.

How far can you run flex duct?





Flexible duct shall be supported at manufacturer’s recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports.

How can I increase the airflow in my room?

5 Ways to Improve Airflow in Your Home

  1. Check Vents and Registers. One of the simplest things you can do to increase airflow in your home is to check the vents and registers in each room. …
  2. Turn on Ceiling Fans. …
  3. Schedule HVAC Maintenance. …
  4. Consider Duct Cleaning. …
  5. Invest in a Ventilator.


Does each room need a return vent?

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. The most important place to have these would be the bedroom.

How do you increase airflow in air ducts?



Increasing airflow in ductwork can be done by cleaning the air filters and ductwork. By adding inline duct booster fans and/or air dampers significantly can improve airflow in weak areas.

How do I make a return air plenum?

Quote from the video:
Quote from Youtube video: Probably gonna be a 3-piece box. You can make them a five-piece you can make them you know three-piece there's numerous ways that they can be made. And ain't none of them wrong necessarily.

How do I add an air return?

Quote from the video:
Quote from Youtube video: But for supply you can't have wires and pipes of them going through the line. So here we have framed out through this Bay right behind the furnace. It's going to go up into the floor base.

How do you frame return air?



Quote from the video:
Quote from Youtube video: And you're ready for return air grills to be installed. Place the grill to the wall. And align the holes in the grill with the holes in the frame. And install the screws.

Can I use flexible duct for cold air return?

Yes, you can use flex ducts for your return air. However, to maximize its usefulness, it needs to conform to technical specifications such as its insulation rating, pressure checks, dust filters, duct sizing and placement, and lastly, the installation requirements.

How many air returns do I need?

Your Home Might Not Have Enough Return Vents



Having several return vents (ideally one in every room, but even two or three is better than just one) creates consistent air pressure. If you have one return vent, your home is fine. Keep the doors to each room open so air can properly circulate.

Should return air vents be high or low?

For optimal efficiency, it’s ideal to have return registers installed. To ensure efficiency during the cooling season, your home should have high registers. High return registers draw hot air that rises to the ceiling back into the system to repeat the cooling cycle.

Can a return vent be in the ceiling?



Most homes across the U.S. have forced air systems and in newer homes there will be cold air return vents placed at both the ceiling and the floor of many rooms. Having two air return vents allows you to seasonally control which air is returning to the HVAC system. In older homes, this may not be an option.

Is it OK to close off vents in unused rooms?

EXPERT RECOMMENDATION: If you want to try to balance the airflow throughout your home, you should not close vents completely; HOWEVER, you can close them slightly (not more than 75% closed) to help distribute air better to the areas that need it most.