Air Handling Units

Anyone can google and find out the word meaning, a simplified explanation of the differance b/w these is what I have requested for?

Anyone can also google and get a simplified explanation of the differences and applications also:

http://cdblower.com/index.php?event=Double%20Inlet%20Double%20Width(DIDW)%20Forward%20Curve%20Centrifugal%20Fan-Blowers

http://www.chicagoblower.com/Resources/Arrangements.html

The information is available to you if you just spend the smallest amount of effort to find it.

You asked what the difference was and I told you, perhaps a better crafted question would yield more desirable results.

Thanks,

Perhaps you should request this free guide:

http://www.chicagoblower.com/Resources/EngineeringGuide.aspx

Or take some of this companies courses in fan applications:

http://www.chicagoblower.com/Resources/FanCourses.aspx

Or just call them as they suggest on their website.

Good Luck.

When my company asked me to develop a line of dust collectors to integrate with some of our current product offering, I didn't ask a question here, I ordered one of these:

http://www.amazon.com/HVAC-Principles-Applications-Manual-Thomas/dp/007044451X

It answered all my questions and answered some I didn't know I had.

oops I posted the wrong book link, this is one I asked my company to purchase for me:

http://www.eburton.com/119.htm

And it was recommended to me by a very qualified friend engineer who has been designing fans and dust collectors for over 20 years.

GA. Answered the questions you din't even know you had. Proper research will do that.

The OP is looking for someone to hold his hand and pat him on the head when he does good.

There you go...."GOOD BOY".... pat pat pat

Invitation declined. Please use an internet search engine instead.

The double is used where a single is not sufficient enough.

I did the same thing as you - I did not search for the information.

But I do not want to know!

Single is single size and Double is double size.

I think of it in terms of In and Out Burgers. A Single has one Patty of Ground Beef, while a Double Double has two Patties of Ground Beef. Some people think that a Double Double means 2 x 2 patties, but that's not the case. If you order a 4x4, you get Four Patties of Ground Beef and Four slices of Cheese - it's a huge meal and not many can finish it.

Fatburger makes things confusing. The Small is 2.5 oz of Pure Lean Beef, the Medium is 5.3 oz of Pure Lean Beef and the Large is 8.0 oz of Pure Lean Beef. As you can tell, it's not a linear progression and it gets worse from here. They don't have an XL, but they do have and XXL, which is 16 oz of Pure Lean Beef. Then there's an XXXL which is 24 oz of Pure Lean Beef. If you eat the XXXL meal, they take your picture and put your name on the wall.

Okay, so I will be honest about my choice of burgers. I like In and Out and I'll usually order a Double Double meal, but when I want a very tasty burger, it's off to one of the old Fatburger stands, where the grease has imbedded itself in the cooking equipment - oh my, they are tasty burgers. And just in case anyone is wondering, the answer is no!. I have not eaten an XXXL meal in one sitting and I don't know if I can.

To summarize, when considering anything Double vs Single, think of In and Out - family owned since 1948. Back then they didn't want to confuse people. And I remember my Rich Dad telling me that I should never invest in anything that I don't understand - skipping an XL does not make sense, but Fatburger does make tasty burgers!

Hi,

The DIDW (Double Inlet Double Width) unit is used to provide a high volume low pressure development, in Air Handling Unit (AHU) applications the higher volumetric throughput requirement "usually" is the norm, and the fans are generally of a forward curved multi-vane blade form. Aerodynamic / aerofoil or backward curved blade impellers are available to provide a higher pressure development where required. these are "normal" applications but individually designed units to suit are available from most fan manufacturers / suppliers.

The SISW (Single Inlet Single Width) are; shall we say, conventional centrifugal fans which are used (mostly) for industrial applications, although they can be used in ventilation supply and extract systems as part of a ventilation in line or ducted (with individually mounted components, i.e. dampers, filters, heaters, coolers et al) "system" rather than in a packaged Air Handling Unit (AHU). SISW units are conventionally designed to a "duty" (volumetric) / pressure requirement with a degree of flexibility designed into the selected unit, again this is the norm, but specials are always available from the fan manufacturers.

Hope this helps