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Thanks for replying ToastMaster. I think I did a really crappy job asking my question, or didn't ask it at all. I understand the cord from the ballast to the lamp has a ground wire in it. I think maybe this question is specific to the hydrofarm lamp cord assembly. The ground wire that comes...

Read about some guy over at icmag.com that got busted while he was using one of those.

I'd actually rather understand the underlying principles of ventilation when designing a ventilation system. Love to learn about things. Not everyone does I guess. Some of the people who post here actually have very helpful information on such things, so thanks to those that post worthwhile...

Could anyone explain to me how to wire a cool tube? How is the socket grounded, how do you connect it in the tube. Basically how do you not electrocute yourself :lol: A lot of the DIY tutorials I've seen, it looks like it isn't grounded? This guy had taken apart a Hydrofarm assembly, the top...

Thank you, that was very helpful! So I guess the only answer to the original question, how much static pressure does a reduction in duct size add, is that it depends on how long the duct segments are, and the only answer to the question of how that affects CFMs depends on your fan and how it...

LOL yeah that didn't sound right to me, that's what it looked like in one of the pics I saw someone had done though. Maybe that's why they are using the little socket and not the whole assembly, it is plastic or something? I don't know, I looked at the tutorials and it looks really simple but...

Someone who knows about static pressure please help!

I've been looking at the DIY cooltubes, and noticed something. They all use the little socket, it looks like the bottom of a Hydrofarm cord set disconnected from the top. The part it is disconnected from houses the ground wire. So, safety being #1... what is the deal with wiring a cool tube...

So I've read a TON about ventilation, and learned a lot. It's an incredibly complex subject the deeper you dig! But I have this really silly question left I haven't seen answered anywhere. What is the relationship between static pressure and the size of a duct? For example, say you have a...

So I want to make a cooltube. For my purposes, a bake-around is worthless, as I need a tube at least 6 or 7" in diameter. The problem? I've spent the last week looking EVERYWHERE on the internet, and apparently a 6" around glass tube, 18" long is an impossibility to find?!?!? Emailed a few...