HRV Duct Sizing Question With Damper - HVAC - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 04-19-2013, 03:30 PM   #1
Member
 
Join Date: Oct 2008
Location: Albany, NY
Posts: 75
Rewards Points: 81
Default

HRV Duct Sizing Question with Damper


I'm trying to design an HRV ducting system and I had a few theoretical questions in regard to using a damper.

I'd like to have two main trunks that come off the HRV: trunk A and trunk B. These two trunks will be pulling the air OUT of the rooms.

Trunk A will serve a kitchen and two bathrooms.
Trunk B will two crawlspaces.

If I place a normally open damper on trunk B, and I energize the damper, the damper will close.

My expectation is that the CFM amount will fall to zero in Trunk B and will increase in Trunk A.

Should I size the Trunk A and the Trunk A branches to accomodate the CFM when the Trunk B damper is closed, or when it is open?

Advertisement

toddmanqa is online now   Reply With Quote
Old 04-20-2013, 04:21 AM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,571
Rewards Points: 4,780
Default

HRV Duct Sizing Question with Damper


Neither.

Trunk A should be sized to 125% of the air you want to go through it when ever the HRV is running.

Advertisement

__________________
When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
beenthere is offline   Reply With Quote
Reply

Tags
cfm , damper , duct , hrv , size


Thread Tools
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
Duct work sizing for 800 CFM unit mattorrell HVAC 11 03-25-2013 03:01 PM
Bathroom Exhaust Fan Duct Sizing Lyndon HVAC 6 02-06-2012 08:35 AM
Old flex duct question doityourselfer2 HVAC 3 12-05-2011 01:37 PM
Question Re: New Furnace and Duct Sizing DSimo HVAC 3 06-17-2008 08:24 AM
Duct sizing question Rob HVAC 1 06-04-2005 01:42 PM




Top of Page | View New Posts