P
Hi,
For the machines my company builds, I use an industrial fan to push air through an electric duct heater on its way to a dryer, and I use a similar fan to remove the heated air from the dryer (along with some solvent that is removed from the product I am drying).
When I buy these fans (which are typically rated to deliver somewhere around 1500 CFM @ SP 2.5 in wg @ 1800 rpm), the fans come with an arrow that indicates the correct direction of rotation. I don't have one powered at the moment to test myself, but I was wondering if anyone here could tell me for a typical fan, what would happen if we ran the fan in the opposite direction?
Would I the resulting air flow direction be such that air would flow into the blower outlet and out of the blower inlet?
Or, would the air flow direction be such that air would still flow into the blower inlet and out of the blower outlet, only with less than the rated cfm?
The reason I ask is because we have a customer that actually is running one of our (supply) blowers in the wrong direction, and they are unwilling to change it because they have conducted trials and a lot of FDA product qualification paperwork that they are afraid will have to be re-done if the switch the blower direction. If air is moving opposite of our intended direction, I can't comprehend how our furnace systems would even work. If air is moving in our intended direction (but with less than rated air flow), I can at least make some sense of it.
Thanks in advance,
Paul
For the machines my company builds, I use an industrial fan to push air through an electric duct heater on its way to a dryer, and I use a similar fan to remove the heated air from the dryer (along with some solvent that is removed from the product I am drying).
When I buy these fans (which are typically rated to deliver somewhere around 1500 CFM @ SP 2.5 in wg @ 1800 rpm), the fans come with an arrow that indicates the correct direction of rotation. I don't have one powered at the moment to test myself, but I was wondering if anyone here could tell me for a typical fan, what would happen if we ran the fan in the opposite direction?
Would I the resulting air flow direction be such that air would flow into the blower outlet and out of the blower inlet?
Or, would the air flow direction be such that air would still flow into the blower inlet and out of the blower outlet, only with less than the rated cfm?
The reason I ask is because we have a customer that actually is running one of our (supply) blowers in the wrong direction, and they are unwilling to change it because they have conducted trials and a lot of FDA product qualification paperwork that they are afraid will have to be re-done if the switch the blower direction. If air is moving opposite of our intended direction, I can't comprehend how our furnace systems would even work. If air is moving in our intended direction (but with less than rated air flow), I can at least make some sense of it.
Thanks in advance,
Paul