DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Re-routing furnace ducts in a old mobile home?




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 10-19-2010, 01:05 AM  
carnuck
Member
 
Join Date: Oct 2010
Location: Seattle/Lynnwood, Washington
Posts: 91
Liked 15 Times on 12 Posts
Likes Given: 3

Default Re-routing furnace ducts in a old mobile home?

The stock setup has one joist channel the full length of the home that was tinned in to heat this place. I'm about to stick a video camera into the ducts, because I'm pretty sure there is either a break someplace or they have open ends. If I have a window open a crack when the furnace kicks on, the air rushes in like a hurricane!
I'm hoping to hire someone to put in insulated flexible duct and seal off the old one, but rodent intrusion is another issue.



__________________
carnuck is offline  
 
Reply With Quote Quick reply to this message
Old 10-19-2010, 12:04 PM  
paul52446m
Senior Member
 
Join Date: Oct 2010
Location: Houghton Lake, Mi.
Posts: 435
Liked 1 Times on 1 Posts

Default

If you want to spend the money and you find a good contractor, you could have them install a all metal duct system, and it could be insulated on the inside so rodents can't get in or get to the insulation. Later Paul



__________________
paul52446m is offline  
 
Reply With Quote Quick reply to this message
Old 10-20-2010, 05:22 PM  
classic
Junior Member
 
Join Date: Apr 2006
Posts: 9
Default duct leakage

Assume that you have a 2 1/2 ton air handler that moves 1000 cfm of air.
Now assume that you are loosing 20% (200 cfm) of this air under the house thru duct leakage. 1000 cfm is being sucked into return but only 800 goes back in, so the house is in a negative pressure situation. Open the window, and the negative pressure sucks the air in.

Trailer ductwork systems are designes for high static and have a small trunk and all supplies come directly out of the trunk. Homes, however, do it right and have a lower static (and larger ) trunk and the supply lines run to the outer walls where the air is thrown up to create a thermal barrier that keeps the outdoor temperature from getting into the house.

Your trailer trunk is thin metal with a rectangular collar that comes out of the trunk and thru the floor
1) if the collar comes looks, air will come out and go between the trunk and
the trailer bottom
2) if the trunk sections come apart, air gous under the trailer

If you are staying in this trailer for a long time and dont plan to move it, it would be worth it to do it right and install a standard trunk (8" by 24") with 3" foil backed insulation and run new supplies to the outer walls.

__________________
classic is offline  
 
Reply With Quote Quick reply to this message
Old 10-23-2010, 12:19 AM  
carnuck
Member
 
Join Date: Oct 2010
Location: Seattle/Lynnwood, Washington
Posts: 91
Liked 15 Times on 12 Posts
Likes Given: 3

Default

I guess it'll be the foil and insulation ducts, although I'd like to wrap them with metal mesh to ensure no rodents (I can hear them fighting in the alley at night. They are too big for the cats to chase around here, but they are too fat and well fed to bother anyways)

__________________
carnuck is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

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 On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
mobile home woodpop2000 Carpentry and Woodworking 2 09-21-2011 11:23 AM
HELP Mobile Home floor repair gennilou Flooring 2 09-26-2010 09:33 AM
55 and over mobile home parks SJNServices General Chit-Chat 5 06-29-2010 12:43 PM
Mobile Home Mom djp Introductions 1 05-27-2007 06:44 PM
Mobile Home and Tile Floor Garymdavis Flooring 2 04-15-2006 08:54 AM