I have no way to measure it, but I believe the 745 CFM claim - this thing blows like a little jet engine. Seriously, keep your hands away from the intake! But, it's not magic. It's really loud, and the product should not be described as quiet. It simply isn't true. I tried using a fan-speed controller to get acceptable CFM with acceptable sound. When you turn the fan down enough to quiet the blades, a very annoying thobbing/humming sound is emitted instead. There really isn't a "sweet spot" where it will just operate quietly. I bought three of the 8-inch model to use as super-duper duct boosters. They are all three the same. If I had to do it over, I would choose a different fan.
Verified purchase: No
I have no way to measure it, but I believe the 745 CFM claim - this thing blows like a little jet engine. Seriously, keep your hands away from the intake! But, it's not magic. It's really loud, and the product should not be described as quiet. It simply isn't true. I tried using a fan-speed controller to get acceptable CFM with acceptable sound. When you turn the fan down enough to quiet the blades, a very annoying thobbing/humming sound is emitted instead. There really isn't a "sweet spot" where it will just operate quietly. I bought three of the 8-inch model to use as super-duper duct boosters. They are all three the same. If I had to do it over, I would choose a different fan.
Verified purchase: No
Very high efficiency. Well built. Would recommend also using a variable speed switch with it to adjust perfect RPM.
Verified purchase: Yes | Condition: New
Happy with it runs great
Verified purchase: Yes | Condition: New
Replacement for fan I had purchased
Verified purchase: Yes | Condition: New
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