Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 12-13-2006, 10:21 AM   #1
Stu
Newbie
 
Join Date: Dec 2006
Posts: 2
Rewards Points: 10
Question

duct sizing


I am currently working on a home addition of just under 1200 sq ft finished. I had a HVAC person size the air and heat. I have about a 65000 btuh high efficiency gas furnace and a 2 1/2 ton air conditioner at 13 seer. I am using a duct calculator to set my duct sizes. I am trying to use standard size duct to avoid the cost of shop labor to make custom ducts. So I am trying to work backwords from the duct sizes to the CFM and Static pressure. I did HVAC for about twenty some years and did a little installation of HVAC. I need some help sorting out how to use the duct calculator.

I would apprecaite some feedback.

Thanks

Stu

Stu is offline   Reply With Quote
Old 12-20-2006, 10:26 AM   #2
Newbie
 
Join Date: Dec 2006
Posts: 12
Rewards Points: 10
Default

duct sizing


For metal pipe duct or rectangular, set the friction scale at .10
for flex duct set it at .06 for supply and .09 for return. Then just line up your desired cfm and it will tell you the proper duct size.

PATMAN is offline   Reply With Quote
Old 12-22-2006, 06:36 PM   #3
Stu
Newbie
 
Join Date: Dec 2006
Posts: 2
Rewards Points: 10
Default

duct sizing


Thanks for the input. I have worked on this for several days and could not get a good answer. I even went to the local Junior college and bought a book on duct sizing and still had problems getting all the data.

Thanks again

Stu
Stu is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Condensation in Wall: Can I Seal a Dryer Duct With Caulk? xquercus HVAC 5 07-01-2007 03:33 PM
Modifying existing duct work Thurgee HVAC 3 04-05-2007 10:35 AM
1000-1400cfm...duct sizing Swordfish215 HVAC 1 01-15-2007 04:22 PM
Can I use duct tape? Dusty HVAC 2 09-27-2006 09:28 PM
Duct sizing question Rob HVAC 1 06-04-2005 01:42 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.