Formula for calculating velocity&floe rate of a fan

Hi Friend! I dont know but I'll will go for a 'MANOMETER' some how which migth give you some good clues of the air movement around there. Just bring your tools box with the proper 'PPE' and don't forget your -Lock and Tag- as safety concern just in case,we never know. Watch out with some Hi-Pressures Duct Inspection Access as well and check it out for some other "Hi-Juice" conduits up there all over. Be Careful! And get your good flashlite with new batteries and an extra lite bulb as they always fall down and blown the little bulb out, it happened many times before. And always take in count 'The Murphy Law' aspects of the whole situation and your be on your way to tackle anything down nicely, don't rush into nothing yet and it will come to you, definetetly.Check-Up for some jammed up louvers down the stream also see if there are not busted pneumatic hoses leaking or loose wires by the VAV's boxes as well, Hey Who Know's, Anything may Happened! Crank That Puppy-Up to see what we have, HaaHeeHiiHooHoooohhh! And Hey! Look for some 'NamePlate' around that Puppy which migth give ya' some important manufacturer data, my friend. Who Worked on that Puppy Before? Hmmmmnnnmhh? Allset Hang in There and Have Fun on It!

You Have the Technology,

MC

Sorry, there isn't one. Look at the manufacturer's curve, it will reveal all that you need to know.

Hmmmnnn? Good Deal overall. The thing is that it will be good to know how about the CFM's for that Puppy absolutetly. Then from there we'll be with some clue to start with and from there with 'the tools of the trade' do whatever adjustments to tune that Puppy-Up. I'll bring couples of sandwiches and Oranges Juices for lunch wrigth there just in case my friend. Nice overtime 'Saturday JOB'.

Done Allset,

MC

Please place brain in gear before engaging fingers on the key board.

1. What type of fan are you talking/typing about?
2. What size fan are you talking/typing about?
3. What revolutions is the proposed fan proposed to run at?
4. Have you ever seen one fly to pieces because it was out of balance or driven to fast?

BAB

Agree, but without the OEM's curve, what formula are you going to use on this data?

Hi,

Air output velocity of any fan/blower depends on various factors like profile of the housing and blade angle to name just two of them. Every manufacturer has perfected their own profiles and therefore it is complex to put down in a simple formula and I am not an authority on the subject to tell you what all factors are to be considered. I am only answering you 'cause I felt some of the responses were not appropriate.

However, for a given make of fan/blower, you may use the Manometer for obtaining the velocity directly at different places on the delivery side and average it. now using simple mathematics, calculate the area of the duct and convert the average velocity in to flow rate for that area.

Cubic Flow Per Minute = (6356*HP*Efficiency of Fan)/Pressure in H2O

Is this fan going to be used in a fixed on ground location or in an aerospace vehicle?