Dust Collector Duct Sizing

Home » Knowledge Base » Knowledge Base Article





	Today's Sponsors: Biesse Group America Biewer Lumber Binks Black Bros. Co. Blackhawk Machinery Brown Wood Products Co. Byrd Tool C.R. Onsrud Cab Parts Cabinet Door Service Co. Cabinet Pro CabinetCRUNCHER Cutlist & 3D Cabinet Design Software Cabinetmakers Association CABPARTSPRO CADCode Cag Lumber Camco, Inc. Carbide.com Carolina Woodworking Consultants Carter Products Carvewright Carving Technologies Cash Coatings Castle Catskill Timber Industries Central Hardwoods Charles G.G. Schmidt Co. Chicago Dowel Company, Inc. CIM-Tech Clear Lake Lumber CNC Auto-Motion CNC Parts Dept. 3M Corporation 5 Star Tooling A Brazilian Wood Depot Abrasive Resource Accu-Right Squareness Gauge Accu-Router, Inc. AceCo Precision Wood Tooling Activa Active Machine & Tool Air Cleaning Systems Air Handling Systems Alan McIlvain Company Algoma Lumber Co. All Star Adhesives Alliance Millsoft Allied Machinery Inc. AllRout Amana Tool Ameitech South American Fabric Filter Co. American Institute of Building Design American National Woodworking Knife American Rotary Converters Andreou Machinery ANEST IWATA USA, Inc. Antique Beams and Boards Antique Building Materials Anver Corporation Apollo Sprayers Inc. Arbor Processing Inc. Architectural Elements ArtCam ATEMAG Atlantic Machinery Corp. Auton Motorized Systems AWFS B.H. Davis Company Bailey's Inc. Bainbridge Manufacturing Baker Products Banks Hardwoods Barn Detail Barn Door Lumber BC Wood Specialties Group BeamsRUS Beaver Tools Benz Incorporated Best Cabinets BetterVacuumcups.com

WOODWEB DISCLAIMS any and all RESPONSIBILITY and LIABILITY for the accuracy and application of the information below. Readers agree to evaluate the significance and limitations of the information provided, and accept full responsibility for the application of this information. Read More ...

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?

Dust Collector Duct Sizing

Where to look for info on proper ductwork diameters. May 16, 2005

Question
I just purchased a 5hp, 4 bag collector with an 8" intake and a 13.1/2" impeller diameter. I need to run about 30 feet of trunk line to drop to most of my machines. The stated useful volume airflow is 2514 cfm and the "collector inlet vacuum~in.H2O" is 5. What would be the right size trunk line in this setup? My table saw needs 1100 cfm.

Forum Responses
(Dust Collection Forum)
From contributor B:
Go to the company you are going to buy the duct from. Give them a drawing of the layout and they will draw the trunk and drops needed to supply the machines. They have a program that does this for them. We did it on our current system and it works great.

From the original questioner:
This is a Woodteck Machine from Woodworkers Supply - same machine as all the other Taiwanese built collectors. Just wondering what other shops have done to get the most suck for the buck on their bag over bag machines.

From contributor O:
Are you using an over-arm blade cover? If you are, you may want to use 8" mains, along with a 7" or 8" drop to the saw, splitting to a 6" to the base, and a 4" to the over-arm blade cover.

This should easily flow well over 800 cfm to the base, with reasonable static pressure losses, and about 400 cfm to the over-arm blade cover, depending on its internal porting. The smallest internal diameter there will determine the flow.

Velocity in the main should be well above desired flow minimums. Velocity in the 7" drop would easily exceed 4000 fpm (closer to 4500 fpm).

These numbers presume that the actual performance of your dc is as stated, and whether or not you're using blast gates for the different drops, as well as the size of those other drops.

Have you reviewed the related Knowledge Base areas below?

KnowledgeBase: Knowledge Base

KnowledgeBase: Dust Collection, Safety, Plant Management

KnowledgeBase: Dust Collection, Safety, Plant Management: Safety Equipment

Would you like to add information to this article? ... Click Here

If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to review our Forum Guidelines.

Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

Return to beginning of article.

Refer a Friend || Read This Important Information || Site Map || Privacy Policy

Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

Contact us to discuss advertising or to report problems with this site.

To report a problem, send an e-mail to our Webmaster

Copyright © 1996-2008 - WOODWEB ® Inc.
All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
Review WOODWEB's Copyright Policy.

The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

WOODWEB, Inc.
RR4 Box 265A
Montrose, PA 18801

Contact WOODWEB