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BTMETER BT-100 Handheld Anemometer, Digital Wind Speed CFM Meter Gauge Air Flow Velocity Tester for HVAC Shooting Drone, Wind Chill, 14℉-113℉ Wind Temperature

When HN users recommended it

1 HN user recommended this in 2026, in one comment.

20072026

Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.

What HN users said

felixgallo linked amazon.com View on HN
in HN thread 47698067, a direct reply to the story

it would be interesting to measure the airflow with a decent anenometer that works at low airspeeds (I've had success with https://www.amazon.com/BTMETER-Handheld-Anemometer-Velocity-...).

My intuition is that the 5 case fans at 72 CFM each are deeply underpowered for the job of moving air through a filter medium, especially in an array pointed into a mutually turbulent unsealed box, and that you would do way better with something like an AC Infinity Cloudline S8, which moves around 800 CFM, aimed directly at the filter in a sealed environment.

It's pretty common for case fans (and even industrial fans) to be used for cheap airbrush stations, which have much smaller filter face openings. These generally don't pull even 1 linear feet/min at the station face, even though they're theoretically rated for over 150 lfpm without the filter media in place.

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