Artificial intelligence (AI) policy: ASHRAE prohibits the entry of content from any ASHRAE publication or related ASHRAE intellectual property (IP) into any AI tool, including but not limited to ChatGPT. Additionally, creating derivative works of ASHRAE IP using AI is also prohibited without express written permission from ASHRAE.
The ASHRAE Duct Fitting Database (DFDB) app allows you to perform pressure loss calculations for all 200+ ASHRAE duct fittings in both I-P and SI units. Use this mobile app in the field for quick duct pressure loss calculations. The inputs can be adjusted by touch, and installation is automatic.
Ashrae Duct Fitting Database Version 6.0 Free Download
Download 🔥 https://cinurl.com/2yGB5h 🔥
The latest update to app incorporates all of the updates for the desktop version over the past 8 years, including more than 30 new fittings, plus updated fitting calcs, reports, and many other new features.
Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. For any given fitting, enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss. The product includes table data for supply, exhaust, and common (supply/return) duct functions. Fittings may be saved into a project file, which is easily navigated and can be stored and transferred.
The database interface features fully available input, output, calculations, and table data properties; and easily viewable calculations that update in real time.
Purchasers receive a one-year subscription for cloud-based access to the ASHRAE Duct Fitting Database ver. 6.00.05.
ASHRAE Duct Fitting Database (DFDB) for the iPhone, iPod touch, and iPad allows you to perform pressure loss calculations for ASHRAE duct fittings in both I-P and SI units. Use this mobile app in the field for quick duct pressure loss calculations. The inputs can be adjusted by touch, and installation is automatic. Purchase this product from iTunes for $9.99 Learn More
Standard 120-2017 --Method of Testing the Determine Flow Resistance of HVAC Ducts and Fittings
ASHRAE Standard 120 establishes uniform methods of laboratory testing of HVAC ducts and fittings to determine their resistance to airflow.
The Duct Size Calculator is a quick reference tool for approximating duct sizes and equivalent sizes of sheet metal duct versus flexible duct. It includes sizing for metal ducts, and for flexible duct when compressed at 4%, 15%, and 30% straight line compression. The Duct Size Calculator is the result of collaboration between ASHRAE TC 5.2, Duct Design, and the Air Distribution Institute. Learn more
2. I am having difficulties installing the program. What do I do?
Make sure to close all programs that are open as this may prevent proper installation. Be sure to close any programs that may be open or minimized on the taskbar. Reinstall program. Reboot computer.
3. I am unable to view the 'Loss Coefficients (pdf)' from the Help menu. What is going on?
This file requires the Adobe Acrobat Reader program available at This program is free and is used to view/print pdf files.
4. In the preferences screen, what is the difference in 'Lost focus', 'Change' and 'Use Calculate' buttons?
This preference was added to allow the user to choose when calculated results were displayed. The 'Lost Focus' selection will recalculate when you move to another field. The 'Change' selection will recalculate after every key press. The 'Use Calculate' button will display a calculate button to click to perform a recalculation.
5. I would like to look at the loss coefficient data used in this program. How do I do this?
All coefficient data is contained in a text file with a .tbl extension. To view this data, choose a fitting, and from the File menu, choose Preview Tbl...
6. What changes were incorporated into the latest version of this program?
Version 6 includes includes an integrated database; fully available input, output, calculations, and table data properties; and easily viewable calculations that update in real time.
ASHRAE Duct Fitting Database, this database, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. Featuring pictorial outlines of each fitting, DFDB is useful to design engineers dealing with a variety of duct fittings. For any given fitting, the user may enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss.
When we design duct and pipe fitting, we will need to use the fittings loss efficient to be ASHRAE or CIBSE. Once in a blue moon, ASHRAE will update their duct fitting loss efficient. Since Revit have ASHRAE in its system, what is the ASHRAE duct fitting database version Autodesk is supporting now? v6.0.0.5?
Thank you for your patients while we verify. I was able to find from our help documentation that Revit 2019 is integrated with the ASHRAE Duct Fitting Database version Version 5.00.00 (Revit 2019 Help: Part types).
Thank you again for participating in the forums! I wanted to check and see if the information provided answered your question, or if you need more help. Please feel free to select 'Accept solution' if you are all set, or reply back if you need more help.
I'm not quite sure what the time-line for getting this updated would be. I'm working on checking with our team to see what their thoughts are on this, and will keep you updated with the information I get!
Thank you for your patients while I check into this. I was able to talk to the team, and they are looking into updating. In the meantime, could you please post the request to update to ASHRAE Duct Fitting Database 6.0.0.5 as an idea in the ideas forum?
Hi Mariah, there is a lot of fittings that have issues with the Co-efficient calculation from the ASHRAE TABLE on the ducts and Pipe fittings. I have traced it back a couple of years now if you look at the forum.
Hello @mariah.ferranti this is also an issue for me. I have a lot of issues with the co-efficient calculations from the ASHRAE table on the ducts and pipe fittings. Is there any plan to fix this, or is this a low priority issue? Unfortunately, these issues make the system pressure portion of the software next to useless, because I am having to do calculations by hand again.
@Anton_Welgemoed Did you find a post on the ideas forum that supports this issue?
This is a problem with all kind of fittings. In this example of a round elbow, it uses mitered elbows, which has higher pressuredrop. As an optimist i say this isn't too bad since it is more conservative. But the fact the 90 defaults to have a lower pressuredrop than the 30 fitting doesn't make sense. Even if i don't know a value is correct, seeing something illogical like that makes me nervous. Also the fact that it is zero at unusual angles isn't good, but knowing it I can adjust to that.
I opened the family but did not see a way to set the type of fittings it uses and the connectors are type "fitting". Since I use Revit to get at least a reasonable number, I like to resolve this or at least improve. Here my questions and ideas and I wonder if someone has ideas:
I started manipulating the elbow duct fitting and replaced the connectors with regular global/bidirectional connectors and assigned a pressuredrop. So far I have to manually enter the pressuredrop, but it seems to work in a system, and also works with auto-route.
Next step I will have it calculate the pressuredrop based on the SMACNA/ASHRAE loss coefficients. I need to find an approximation that changes the coefficient based on the angle parameter. But it looks like it could be done to calculate pressuredrop based on actual flow (and a velocity that derives the velocity pressure).
I also saw ASHRAE has different coefficients based on duct size, while SMACNA has one coefficient. I guess that can be implemented somehow. At least to a point that it makes more sense than what Revit does oob.
Then in the project, set all the Loss Method for all of the fittings to "Specific Loss" (you can do this with a Dyanamo script or using a duct fitting schedule). After all this, the built in pressure drop calculator will work fine.
The tricky part is that some fittings have two different loss coefficient tables. A booted tee, for instance, has a different pressure drop if it's diverging (like on a supply system) or converging (like on and exhaust system). You can either build two different families and remember to use the right family, or you can add a Converging/Diverging check box which changes which loss coefficient table is used. My goal is for the Ripple plugin is to keep track of connector flow directions in the background and automatically set your converging/diverging setting.
In the project it still is set to ASHRAE. But if I try out and set the pressuredrop to 1", the system pressuredrop raises by 1" and that branch becomes the critical path. Obviously this isn't a validation of my family yet....but tying the pressuredrop value to the duct connector seems to override whatever the project does with fittings. (Don't quote me on that.....:-)
But I created a duct fitting schedule and included ALL available parameters, but I can't see one that looks like it is setting the calculation method. which parameter do yo mean to set the "loss method"? I came across similar advice in a different thread, but seem to not be able to see such parameter in a schedule. 152ee80cbc