thanks a lot for the great video. This was very helpful. I actually thought power consumption would increase due to the lower fan efficiency. I guess the lower flow and pressure performance outscore the lower efficiency :) What would the effect be if the impeller was installed opposite. I.e forward inclined?
Thanks for watching! If needed, nyb can engineer a system utilizing multiple fans in series (typically 2) mounted on a skid to achieve pressures beyond 200” wg (7 psi or 50 Kpa).
Long story short; you get about a third of duty. This normally happens when the sparks wires the fan backwards…been involved in the vent industry for 20 years and I get this at least once a year still, when a contractor rings up telling me my fans are s*^t and not achieving duty. Either your commissioning guy hasn’t moved the potentiometer pot or the electrical boys have wired it back to front. Contractor is adamant he hasn’t but goes to check it…never hear from them again 😂 My question is; why aren’t we looking at saw tooth on the trailing edge of the blades, to try and reduce the noise levels? What kind of dB(A) reduction can we get, especially on larger units above 1m3/s. Would really help on the breakout noise from some of our AHU’s.
Hi! Thanks so much for reaching out. The term backward inclined comes from the fact that the air across the blade surface deflects in the opposite direction of the rotation. This may seem counterintuitive, but it allows for the fan as a whole to generate static pressure more efficiently because part of the diffusion is done by this backward deflection rather than the fan casing. For this reason, BI fans generally have the highest efficiency and are best suited for medium flow and medium pressure applications. When referencing a BI wheel, the blade angle radially out from the hub will always be less than a 90 degree angle. Hopefully this is helpful. If you have further questions about this topic, please feel free to email us at nyb@nyb.com. Thanks!
Awesome video!
Thanks Danielle! We appreciate you watching
Great video.
Thanks so much Gary!
thanks a lot for the great video. This was very helpful. I actually thought power consumption would increase due to the lower fan efficiency. I guess the lower flow and pressure performance outscore the lower efficiency :) What would the effect be if the impeller was installed opposite. I.e forward inclined?
fantastic!!!
Thank you very much! We appreciate the feedback and are glad you found the video helpful.
Hi Matt. Thano you for the precise vid.
Does your department design custom multistage blower systems?
Thanks for watching! If needed, nyb can engineer a system utilizing multiple fans in series (typically 2) mounted on a skid to achieve pressures beyond 200” wg (7 psi or 50 Kpa).
Long story short; you get about a third of duty. This normally happens when the sparks wires the fan backwards…been involved in the vent industry for 20 years and I get this at least once a year still, when a contractor rings up telling me my fans are s*^t and not achieving duty. Either your commissioning guy hasn’t moved the potentiometer pot or the electrical boys have wired it back to front. Contractor is adamant he hasn’t but goes to check it…never hear from them again 😂
My question is; why aren’t we looking at saw tooth on the trailing edge of the blades, to try and reduce the noise levels? What kind of dB(A) reduction can we get, especially on larger units above 1m3/s. Would really help on the breakout noise from some of our AHU’s.
this makes me want to drink water and also increases blood flow towards my right knee cap! good video 🤌
Why are the blades called "backward-inclined" (I've also heard "backward-curved"), then? In relation to what?
Hi! Thanks so much for reaching out.
The term backward inclined comes from the fact that the air across the blade surface deflects in the opposite direction of the rotation. This may seem counterintuitive, but it allows for the fan as a whole to generate static pressure more efficiently because part of the diffusion is done by this backward deflection rather than the fan casing. For this reason, BI fans generally have the highest efficiency and are best suited for medium flow and medium pressure applications.
When referencing a BI wheel, the blade angle radially out from the hub will always be less than a 90 degree angle.
Hopefully this is helpful. If you have further questions about this topic, please feel free to email us at nyb@nyb.com.
Thanks!
There doesn't seem to be enough air flowing.
Was the motor wired wrong?
Never mind.
What happens with a ceiling fan or a domestic exhaust fan when it's reversed?
I would love to work for NYB in LaPorte. I know a couple of employees and they rate the company very highly.