will 2 250 cfm duct boosters = 500 cfm

heres my set up but i wanna know if i add one more if that'll do the trick? http://youtu.be/lyQYRmwEkt0

the one helps but i wanna see if two will achive what im really after here

I'm no expert, but I'd be willing to bet if the two fans were independent systems the total cfm would = 500. however, if you put them both in the same system their would probably be some sort of diminishing of performance. how many watts is your light? why do you need 500cfm?

well my light is a 400 hps but those duct booster dont really put out 250 cfm i dont think, i think they put out like 160 but can handle up to 250 but yeah its just way to hott in my tent

Yeah man if you put two inlines in the same ducting it wont move really any more air then only having one....because the second fan is going to restrict the the first fan from pulling anymore air then it already is....if that makes sense.

Like say a water nozel is capable of pushing 100 gallons per minute...no matter how much extra pressure you put behind that nozel...its only going to do 100 gallons per minute.

Booster fans are rated at 250 cfm when boosting an existing current of air. They are typically used in HVAC when the register is far from the source <heater,A/C> and it needs a boost of air. They typically use one size under the current size ducting also. So those are FREE air CFM ratings, get anything behind it, 90's,HEPAfilters, long runs of duct and it will diminish at an astounding rate.

Booster fans are rated at 250 cfm when boosting an existing current of air. They are typically used in HVAC when the register is far from the source <heater,A/C> and it needs a boost of air. They typically use one size under the current size ducting also. So those are FREE air CFM ratings, get anything behind it, 90's,HEPAfilters, long runs of duct and it will diminish at an astounding rate.

You have to keep in mind that 250CFM fans will never produce 250 CFM of air movement. 250CFM Refers to 250 cubic feet per minute of air moved at standard temp and pressure (room temp @ sea level) 90% of the planet doesnt fall under those conditions. Also the 250CFM manufacturers rating also refers to a single fan in a duct with no other obstructions. Filters, ect reduce airflow. Expect 250+250=~350-400 depending on your altitude and temps. Obnoxious amount of air movement though you should be fine regardless with a light of such low wattage

well i just bought a carbon air filter and fan so im set now thanks guys