cyberduck Posted July 2, 2007 Share Posted July 2, 2007 Has anybody calculated how much these light baffles stop airflow? I know that each right hand bend in ducting reduces the volume of air by 50%. So does a light baffle with 4 right angle changes in direction reduce the volume of air extracted by nearly 94%? Link to comment Share on other sites More sharing options...
Jam-Rock-Manc Posted March 18, 2008 Share Posted March 18, 2008 is this the only way to do this does it reduce airflow? Link to comment Share on other sites More sharing options...
flizzy Posted March 18, 2008 Share Posted March 18, 2008 is this the only way to do this does it reduce airflow? The larger you made it, the less it would reduce airflow. However if your worried about airflow you may need to have more powerful extraction or use an active intake (eg. a pc inside the light baffle) Link to comment Share on other sites More sharing options...
dakter Posted August 4, 2008 Share Posted August 4, 2008 Does anyone have the calculator from spobart knocking around my head is struggling with the maths ? thanks Dak Link to comment Share on other sites More sharing options...
GrowAlone Posted August 21, 2008 Share Posted August 21, 2008 I ve just been told i need one of these, Great easy to follow, easy to make, does it matter about depth of the baffle?? as space is tight... Link to comment Share on other sites More sharing options...
TracheotomyMan Posted June 10, 2009 Share Posted June 10, 2009 Wouldn't it be better to just rig up an S-shape piece of ducting as your intake? That would prevent any light from entering your grow room, would it not? Excuse my ignorance as I'm entirely uneducated in this sort of thing. Thanks for the info. Link to comment Share on other sites More sharing options...
erbivore9 Posted June 11, 2009 Share Posted June 11, 2009 If you use an intake fan then all you need is a duct hole but a passive intake needs to be at least 4-5 times the volume of the outtake, so you need a bigger area to allow for resistance. Link to comment Share on other sites More sharing options...
bonnie123 Posted July 5, 2010 Share Posted July 5, 2010 nice one mate im on with one later thanks Link to comment Share on other sites More sharing options...
lazycrazy Posted August 18, 2010 Share Posted August 18, 2010 With my homebox, in order to allow passive air intake but no light, I find it easier to just place the tent in a corner, thus allowing me to open 2 out of 3 intake holes WITHOUT ANY light buffle. Link to comment Share on other sites More sharing options...
wupfunk Posted January 14, 2011 Share Posted January 14, 2011 i just quite literally 'fashioned' one of these things out of some tape and a large crunchy nut cereal box........blue peter style baby! cut a little intake hole in my window blackout plastic (multi-layered bin-bags ) and fitted it on.....cold and windy a few days ago, walked into the room with my tent in, and it was fooking freezing!!!!! worked TOO well hehehehehe genius idea. 5 years after originally posting, still teaching noobs! thanks for the advice lucid Link to comment Share on other sites More sharing options...
areader Posted January 17, 2011 Share Posted January 17, 2011 The length 'Y' is arbitrary.... ...Ok I've only got enough wood to make 'Y' about 2.5 times the 'X', will this suffice or do you think it will allow light to get through? cheers Link to comment Share on other sites More sharing options...
madmonster Posted April 24, 2011 Share Posted April 24, 2011 Going to make one of these myself just might need to be large for it to work effectivly. thanks for thread Link to comment Share on other sites More sharing options...
beanpopper Posted July 14, 2011 Share Posted July 14, 2011 My maths seems to have gone down the pan since I left school all those years ago. If I have a 4" 100CFM fan my baffle dimensions should be ... 7.93" y 2.27" x 1.13" z Is that right? If I'm going to have 2 passive intakes at the bottom of my cupboard should I half those dimensions ? didnt get chance to see the calc but from the information given id say the values have been multipyed as prescribed:) but theres a missing value there, for the length of the intake which would determine the value of z It all depends on how long your intake hole is eg my fan is 100mm (so PixRx2 is about 31 cm2 ) My intake will be roughly 31cmx5, 159cm2,(ish), and because of the size of my cab i can use 27cm long intake, so x=5.9 ish. 27cm X 5.9cm =159cm(ish)so should do Therefore x= (for me would) 11.8cm and Y= 33ishCm it all depends wether you have space for a long slim intake or a wide tall intake. hope this helps folks . PM if you get stuck Link to comment Share on other sites More sharing options...
L'Emmerdeur Posted September 23, 2011 Share Posted September 23, 2011 my fan is 100mm (so PixRx2 is about 31 cm2 ) You're worse at maths than me bud. Pi*(R*R) is what you should have done. 3.14(5*5) = 78.5cm2 78.5*5 = 392cm2(ish) 27*14.5cm I know I'm a bit late but... meh. Link to comment Share on other sites More sharing options...
ledman25 Posted October 25, 2011 Share Posted October 25, 2011 thanks mate nice 1 Link to comment Share on other sites More sharing options...
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