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Also the PDF that has details on the fan on the HVAC site posted earlier in this thread is extremely useful if considering one of these fans. For example I am using a can filter 33 that causes a static pressure of .75 and is rated for 200 cfm(found on the can filter website). Using the chart...

I also use the speed controllers. What I found is that they do generate some noises from the motor but not very much. If you run the fan above I would say 50% of max , the spead controller does not cause any hum. What i did note the speed controller is not accurate. For example if you put the...

I am building a cab now. I have two steel cabinets taht are 2 x 3 x 7 . I have 2 Sand P 200 x pushing 478 cfm. One for my cool tube and one for a can filter 33 carbon scrubber. I also have a TD-100 venting my veg through a can filter 2900. I took that fatmat advice and was able to silent...

dude must be old as hell as RO has been around forever, put into practile use in the 40's.

SpecialK Did you order the speed controller from Fantech BOSCH AirScape Suncourt Metlund Laing Thermaflex Exhausto Mr. Heater Dayus Airscape Paloma and more. ( place you order the ordered the fan from?)

PLEASE HELP - driving myself crazy I plan on using these fans for a updtaed growbox. From what i have heard these are the quietest fans available for how much cfm they push while having a good SP rating...would anyone disagree? I am currently building a cabinet similar to the SuperCloset. I...

What CFM are you running through that cooltome and does what temperature does it raise it above ambient? TY

How would you place one of this in the a closet do they generate any heat?