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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.
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