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I bought this to boost airflow in an area of my home that is quite far from the main furnace and gets little cooling/heating airflow. I had previously used another duct booster brand that sat on top of the grate and turned on/off automatically based on the temp of the air from the duct. Those units were really noisy and the airflow was just slight better than just the regular, non-boosted airflow. Didn't really feel much of a temp difference in the rooms. Plus, they died after a couple years of use. This airflow booster unit is quite different. It uses a squirrel cage fan instead of the circular fan found in most other units. The squirrel cage fan creates a lot of airflow. The whole unit also mounts inside the duct outlet so is hidden from view except for the power cord which is very nice from an aesthetic point-of-view. It is quieter than the above-the-grate models, too. This duct booster really made a noticable temperature difference in the room where it was used. It was by far the quietest one with the best airflow as well. Installation is a snap, too. Just drops in the existing 4x10 inch duct opening. Plug in the cord, turn on the switch and you're up-and-running. This unit does not sense temperature to turn itself on and off. In fact, it has no "smarts" whatsoever. It's merely a fan that fits in the vent opening with an on/off switch that controls fan motor. It's either always running or off. Air will flow through it when it's off, but at a reduced rate because of the size of the unit. . This booster allows me to leave the furnace fan on "auto" since these booster does the job of the furnace fan and, in doing so, saves wear-and-tear on that furnace fan. However, while these boosters are quieter than the above-the-floor units, they are not completely silent when running so you definitely know when they're on. It's not motor noise, though, it's the sound of the rushing of air from the high airflow. That can't be avoided. As for the perfect opening, this booster is fairly bulky. When properly installed, the entire unit sits quite deeply in the duct opening flush with the floor or wall. You should check the clearance inside your duct outlet below the grate opening before buying this booster. The ductwork opening must be no smaller 4" x 10" for this model (it fits quite precisely in that opening). If there any bends or narrowing of the ductwork inside the duct opening, they may block this unit from fitting flush with the floor or wall. For this booster to drop in cleanly, there must be at least a clean 3" drop into the ductwork for the unit to fit flush. It truly made my far bedroom much more comfortable! Well worth the purchase.Read full review
Verified purchase: Yes | Condition: New
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