How 90 Deg. Elbows Affect Fan Performance (System Effect Series 1 of 6)

[@princegustavious]

Fantastic tutorial! Is the vane in the 90 degree round duct a custom fabrication? Or is there an out-of-the-box solution?

[@NewYorkBlowerCompany]

Hello! The vane inside the round duct shown in the video is a custom component. There are fabricators who manufacture guide vanes, most of these are designed for rectangular ductwork and require installation.

[@princegustavious]

Thank you @@NewYorkBlowerCompany ! For this fabrication, do you recommend a single or double walled (e.g., hollow) turning vane?

[@NewYorkBlowerCompany]

@@princegustavious There is no one type fits all applications turning vane. Each application should be looked at in a case by case situation. Abrasion, moisture, duct shape, duct size, incoming flow conditions, etc. influences vane type, # of vanes and vane shape. Double walled works well in abrupt, rectangular ductwork however users may experience condensation inside the vane when used in high moisture applications. Single walled are often used in round, long radius elbows. Hopefully this is helpful! Thanks

[@juliakott9951]

Great info!

[@NewYorkBlowerCompany]

Thanks for watching!

[@davidmaletich9392]

Let us know other topics you would like us to discuss.

[@kevinderosia8724]

Will changing the size of the 90 improve the air flow.....IE. Going from 6 inch to 8 inch 90 then back to 6 inch?

[@NewYorkBlowerCompany]

Hey Kevin! Changing the number of gores in the elbow and increasing the radius of the elbow will improve the flow (AMCA Publication 201 is an excellent resource). Regarding changing the duct diameter, this can create issues resulting in additional system losses and turbulence if the expansion/contractions are too abrupt. Most design organization (Industrial Ventilation Manual/ACGIH) recommend a max. transition angle of 15 deg. (7-1/2 deg. per side). This can result in long transitions.