Noisy air ducts can be troublesome for the whole family. The loud popping, banging, and knocking sound combined with the rush of air is sure to be an unpleasant experience for anyone. When switched on, all HVAC systems do make some noise. But if it becomes excessive, AC duct cleaning will be necessary.
Common Cause of Noisy Air Ducts
Why do air duct bangs & pops?
If your air duct makes excessive noise like banging, knocking & popping, then it may indicate some problem. You may want to know the different ways and means to reduce or just stop the noise completely.
One main reason cited for a loud noise to emerge from the air duct is due to differences arising in pressure between return ducts and supply. The other common cause is contraction & expansion due to temperature changes.
Contraction & expansion
If on switching on the furnace, if you get to hear only popping & banging noise, then it may be because there is a flow of warm air through the cold ducks. This causes expansion in metal and creating that ‘pop’ sound. Again, if there is creaking noise, then the duct could experience expansion near wood.
Oil canning
As the air duct walls move in & out because of pressure differences, then you are likely to hear popping, rumbling sounds often termed as ‘oil canning’.
Steps to Stop Air Duct Noise
Regular AC duct cleaning can help reduce unwanted noises made by your HVAC system to a great extent if not completely. You can, however, undertake several things given below to diminish loud noises.
Check Actuator & Dampers
Dampers may be closed or open. Check them on your ductwork’s supply-side and open them at a time and find out if it reduces banging & popping noises. Also, adjust the actuator within the duct damper downwards or upwards to reduce noise.
Clean, seal, insulate ductwork
This is indeed an effective solution, although it might cost some amount. Besides reducing pressure differences, it also helps to soften the effects of metal ducts contraction & expansion. For professional AC duct cleaning services, always rely upon a reputed and experienced company like Kimiclean.
Change air filters
Smooth airflow is severely restricted by clogged air flow. Changing the air filter is the best option here. The air filter needs to be cleaned every 30 to 60 days to ensure improved indoor air quality and HVAC efficiency.
Scheduling maintenance
Inefficient & dirty HVAC systems might cause unwanted noise. It will be better to schedule AC maintenance during spring & heating/furnace maintenance during fall.
Rectangular vs. Circular vents
When compared to rectangular vents, circular vents are said to make less noise. The reason is that rectangular vent walls move easily in & out. Having more support, circular vents move less, thus making less noise.
Use ductless zoning solutions to replace the HVAC system
Installation of the HVAC system can help eliminate noisy air ducts. Contact the professionals to know more about ductless mini-split systems.
You can hire the AC duct cleaning professionals to reduce the noise of your air duct.
