Clean the fan blades
Don't use a hose, it will rust the motor and bearings.
if the blades are metal, and the unit is detached from the furnace. Try carburator cleaner or brake cleaner - out doors away from flames. Also, rotate so no solvents get to the bearings and wash away he lubricants. The solvent evaporates quickly but it will take a minute so don't be too impatient to get to the next blade.
If they are just dusty, and you don't want to dismount the unit, try some canned air - office stores carry this for cleaning keyboards and such. To get a really good stream, turn the can upside down and spray. The liquid propellant will come out and makes a really good cleaner. It will be cold cold cold as it evaporates and some ice will form if the humidity is high enough.
Effectiveness will depend on what is causing the dust to stick to the blades - oil film, soot from wood/coil/fuel oil and cigarette smoke are difficult.
Mar 10, 2014 |
Essick Air MA1201 Moist Air Whole House...