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Are these AirMaid systems effective for cleaning extra-heavy-duty exhaust from solid-fuel commercial cooking applications? If so, is there other equipment required to be part of the design, such as filters, when the exhaust air is discharging through the side of a building in a densely populated area?

For those wanting to look into it in more detail, the "Do not operate region" is where a couple of undesirable conditions known as "surge" and "stall" occur. In surge, you typically have a more or less unrestricted inlet, and a large volume of air downstream that can allow pressure to build up without escaping. In stall, you have a flow restriction greater than the maximum static pressure the fan can achieve. Because the fan can't generate enough pressure to get the air moving freely, the flow rate gets stuck in the stall trough. It's not really visible with the fan selected for the video example, but other fan curves can have rather dramatic valleys in them towards the left side of the curve. Hunting is not an inherent behavior of the fan, it's found when the fan is controlled with a feedback loop (a PID in some form or another), most commonly controlled off of static pressure. If you try to operate in a region of the curve where one static pressure can indicate two different flow rates, you end up in a situation where the controls endlessly ramp the fan speed back and forth, or endlessly move a damper, because it can't settle in to a single operating point.

Why can’t I change playback speed on this video?

This was incredibly helpful, thank you!

Thank you for this video, really appreciate this👌🏾

27:00 Thank you so much for such a great explanation! I work in controls and could not understand the purpose of the bypass damper when VFD is used. If I understood correctly, we can skip the bypass when variable geometry nozzles are used with VFD

can you provide us with the cfm/ft for all type of hoods? thanks

😔 'Promo SM'

Is this chart just for your fans, or any fan in any system.

Thanks for sharing