Feb 23, 2017 · It will consist of a fan (blower Hepa filter and active carbon filter. I have no problem with carbon filter and fan specifications matching, but I am having a hard time putting Hepa in the equation, because I am so confused about calculating appropriate Hepa specifications in relationship with the static pressure drop.

Nov 12, 2011 · Here's what I found: 1. It is easy to recognize total scams if you aren't a complete idiot. For example: Since an air purifier is a filter with air flowing through it, good filtration requires a fan. Duh. My favorite, though: Plants are not air purifiers and even if they were, you don't have to buy a device to house a plant you already have. 2.

Apr 9, 2015 · The bigger the flow, the bigger the restriction. It is generally a good approximation to use the «2nd fan law» equation you mentioned. So if you know that at, say, 400 cfm you get a 1" pressure built up in front of the duct (filter, bend, whatever), then you can estimate that at 566 cfm you will get a 2" pressure build up [ = (566/400)² * 1].

Oct 6, 2023 · hello everyone, i am building a laminar flow hood for plant tissue culturing and have a question regarding flow and filters. my issue is i want a decent size of work space, that isn't all cramped up. as it stands, a 12"x24" hepa or merv 17 rated filter …

Oct 16, 2023 · In the absence of a pre-filter, you will have to change the HEPA filters periodically. Are pre-filters costlier than HEPA filters?

Jun 26, 2018 · On the sides of the purifier (360 degrees) are lots of slits (behind them is the pre-filter and filter). I am assuming that the purifier sucks air in through the sides with slits and releases it from the top.

Nov 19, 2013 · I have a VFD fan that pushes air through a filter. Over time, downstream resistance gets higher due to the filter. Fan speed remains constant. We have looked at amperage draw and it has remained stable even with this added resistance. Does that mean that air flow remains constant? Kind of...

Jul 20, 2018 · In general as a filter clogs the pressure drop across it increases. If the pump has excess pressure potential, and specifically is controlled by the downstream pressure, then it can remain the same up to a point. It really depends on the rest of the system though. In your post though you state the regulator is upstream.

Feb 14, 2012 · Hi all, i have ordered a 30W/230V soldering iron for doing some hobby projects online. First instance when i tried to use soldering iron i found the time it took to get heated up was very huge, some how i managed. After some several uses now when i am trying to use it is not getting heated. I...

Jun 25, 2015 · There are a lot of nuclear power plants around the world that have smoke stacks, the kind you'd usually see at a coal fired power plant. Are they to release steam in an emergency, or are they some kind of exhaust system the plant uses, or something else? Most nuclear power plants in America have...