Toolazy Quiet 8" Inline Duct Fan 831 CFM Ventilation Exhaust Fan EC Motor and External 0-100% Variable Speed Controller for Heating Cooling Booster, Grow Tents, Hydroponics

This is a very high volume fan. Mounted in the attic it isn't too loud and it isn't any louder than the HVAC fan that is there now. I installed this on the furthest run from the unit to help cover the far end of the 2nd level. The fan works really well and the variable adjustment allowed me to dial in the flow that I needed to provide assistance but not 'steal' airflow from the other areas of the house. The only challenge was getting the unit mounted into the bracket once installed. It has these 2 clamps that hold the motor inline with the two ends. On the intake side of the fan there is a plastic insert that helps channel air on the intake side, getting the two ends of the unit, plus this plastic piece was kind of difficult. Adding the heat from working in the attic wasn't the most fun. All in all it was done and works well. Considering buying another to improve the flow in another area of the house.

I bought this in hoping it would draw heat to our addition room and unfortunately itdoesn't do the the job in the winter. I will say it does better with the central air but inthe winter I am disappointed with it.

Installed in attic for 2nd floor with airhandler in basement did the job nicely ran 2 months of A/C with this running g 24/7 still nice and quiet and no issues going into heating season. Made it through another summer running 24/7. Edit Oct2024

Added to long run for HVAC ductwork that's splits into 2 8inch duct vents and 1 4inch and has plenty of power to push the air as well as very quiet up in attic. Its been perfect so far,