A tech replaced the blower motor and cleaned the fan blades a month ago so ruling out motor or dirty blower wheel.
Forced air heating fan noise.
Noise forced air heating is not quiet.
Mark center of start collars on the return and supply side of the heating duct.
And finally all this working together can vibrate all or part of your furnace.
Noisy blower wheel on residential forced air furnace.
Gas burners inside gas furnaces ignite and fire as gas flows in.
The motor for the blower makes noise as it works to spin the fins which get air moving.
And since less air is moving through your ducts noise levels are lower sometimes dramatically so.
The amount of noise depends on how much air the fans must work with how hard the fan must push the.
You ll still know your system is working.
A forced air system is also efficient for distributing cool air from a central air conditioner with the same ducts registers and blower.
The fan speed varies depending on the cooling or heating load but the fan operates at lower speeds most of the time.
It eventually passes through the vents to heat the entire room.
There is little that can go wrong with a forced air system.
In this video this old house plumbing and heating contractor richard trethewey explains how to quiet a noisy forced air system.
Although there is a grate to protect against objects obstructing your fan small twigs and debris can make its way inside.
After all it s pretty obvious whether you re comfortable or not.
Outdoor unit regardless of a heat pump or air conditioner a sudden loud rattle is usually due to a branch or other type of debris stuck inside the exhaust fan.
The big problems typically include noise and blockage of airflow usually caused by dirt or by furniture or draperies blocking the registers.
Noise occurs when the fan blows the air through the ducts.
In this type of system hot air is forced through a spiderweb of duct work that runs throughout the home.
Noise from a wheel out of balance is completely different from noise due to a restriction in air flow from a plugged coil.
Cut holes in sheetmetal ducts using a drill fitted with a circle cutting jig.
