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Air Vent Problems

What is an air vent?

When an HVAC system uses ducts to carry cold or warm air around a house or any other building, vents are placed at specific intervals to allow the air from the ducts to enter a room and control the temperature there. In many cases vents are designed to be opened and closed so as to regulate the flow of air. Air vents also refer to the valves that allow pressure to escape from a sealed pressurized HVAC and other systems. Experts on JustAnswer have answered a large number of questions on air vents, air vent deflectors, air vent filters, air vent extenders and a wide range of other air vent issues below.

The air vent on my hot water furnace leaks as the furnace cools down and it is warm outside. Why does this happen?

The cause of the leak is due the fact the metal contracts as it cools, allowing the leak to occur. You may need to change the vent. This requires you to lower the pressure to zero. Once this is done, the old vent can be removed and a new one fitted. There is no need to drain the boiler. With the new air vent in place, re pressurize the system and see if the pressure holds steady. If so, the leak problem should not occur. If the leak remains, the expansion tank will need to be checked and, if defective, be replaced.

My child dropped a plastic ball down the floor air vent and it is lodged in the duct. When I start the heating, will the ball be a hazard?

There is a possibility that the ball may find its way to the furnace and be burnt there. If that happens it will create a smoky mess with the smell of burning plastic in your house. You could either take the risk that the ball does not get to the furnace or cut open the duct and retrieve the ball. I would suggest getting the ball out as you never know when it may reach the furnace.

Some water leaked from the bathroom and went down the air vent and then into the furnace. After that, it is not lighting and the fan is not working. Should I call a technician or can I try to fix it myself?

First of all turn off all the power and check to see if the bottom of the front panel is dry. Then turn the power on and reset the breaker. If the system still does not come on, check for dampness in the burner or the control box area. If you find it to be damp, it is likely that the water caused something in the control board to short. Another cause could be that the water has violated the integrity of the safety controls. I suggest getting a technician to check the system.

I replaced the air vent on my boiler. I tightened the red cap and turned the vent to the OPEN position but I think there is still air in the system. Pressure is over 30 psi. What should I do?

When you replaced the air vent you may have allowed air to enter the system in which case you will have to purge the system. However, with over 30 psi pressure, it appears to be more like that you could have a defective Expansion Tank or Feed Valve. If the pressure rises as the boiler heats up, then the problem is most likely to be the Expansion Tank.

My floor air vents are cold to touch but no air is coming out of them even with the fan on, what could be the problem?

It appears the air conditioning coil is iced up leading to the airflow being blocked. Turn off the system and let the ice melt. Ice formation on the coil has two common causes. The first is a clogged air filter. Please check it and clean or replace as necessary. The other possibility is that the system is low on refrigerant. You should call a technician to check for leaks and recharge the system. There is condensation forming on the air vent and ductwork near the cold air return. What could be the cause? The condensation could be forming because the surface temperature of the air vent and duct is below dew point. Low air flow could be the cause. Check the position of the damper on the humidifier. It should be closed for cooling and open for heating. Next check to see if the air filter is blocked. Then make sure all the registers and grilles are open. It problem remains it may be because the duct is in a non-air conditioned space and may need insulation.

Troubleshooting air vent problems can often be a complicated exercise because all the factors that affect the operation. The best way to deal with air vent issues is to follow the instruction in your owner’s manual. However, if the information you need is not available there, the wisest thing to do is get help from Experts.

Ask a HVAC Technician

gotoman for ac
gotoman for ac, HVAC Technician
Category: General
Satisfied Customers: 4766
Experience:  51 years of experience install design and repair of all makes and models of AC
19613070
Type Your HVAC Question Here...
characters left:
2 HVAC Technicians are Online Now

How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

HVAC Technicians are online & ready to help you now

gotoman for ac
HVAC Technician
Satisfied Customers: 4657
51 years of experience install design and repair of all makes and models of AC
Phil
Mechanical Engineer
Satisfied Customers: 3888
Retired HVAC/ Electrical & Boiler contractor. Industrial
Rick Mather
HVAC Technician
Satisfied Customers: 3132
35 years experience, HVAC

Recent Air Vent Questions

  • Gentlemen...What is your opinion on Dehumidifiers. We have

    Gentlemen...What is your opinion on Dehumidifiers. We have just had a new furnace and A/C units installed. The furnace is a SmartAir 2000, 96% AFUE and we find the air a little damp, condensation collecting in ceiling corners in kitchen and 1 bedroom, and some condensation on windows. This past summer we had Triple pane windows installed and they too are getting some condensation in the lower corners. We are 2 retired elderly folk, and we feel the cold differently than when we were younger, so the windows have been closed. Our home is only 950 sq. ft. so our question is a request for your feelings on whether we need a Dehumidifier or not.
  • Looking for info on "air intake shutters" on rheem rgaa-080A

    Looking for info on "air intake shutters" on rheem rgaa-080A gas furnace.
  • I am installing a mini split with 3 air handlers. Two of them

    I am installing a mini split with 3 air handlers. Two of them will be fairly close to each other in different rooms on the same side of the house whereas the other is about 25 ft away on the other side of the house. I am trying to get away with using only one compressor, and my question is about the single one that is across the house. I am not sure what the requirements are regarding the lines that need to be run from the air handlers. I understand that their needs to be pitch for the refrigerate lines. Is their a rule of thumb for pitch that would run for 25 feet as I wanted to run the lines through the ceiling across the house. Bear in mind that I intend to use a ceiling cassette for this particular one since if it was mounted on the wall, and I run the refrigerate lines through the ceiling, they would go vertical before going horizontal.
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