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 12-13-2008, 10:26 AM   #1
Newbie
 
Join Date: Dec 2008
Posts: 4
Share |
Default

Outside air getting in through returns?


My house is constructed with an outer brick wall and an inner thin cinderblock wall with maybe a 3/4" gap between them. I have 4 ventilation returns that go through the inner cinderblock, and then down into the basement and into metal vents. They are exposed to the 3/4" gap between the inner and outer walls. It seems to me that one way or another outside air is getting drawn into the returns. I'm thinking about using some sheet insulation or something to seal the vents off from the brick and the gaps.

How common is this style of return? Is it really as crappy as it seems? Any hints on improving it?

Klamath is offline   Reply With Quote
Old 12-13-2008, 11:42 AM   #2
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,615
Default

Outside air getting in through returns?


they are just drops from the heated space running thru that unheated space between the walls .....sure anything you can keep that return as true to the temperature of the space as the unit returns it will help(stat shuts the heat at 70F say..).it might not be a leak(running negative)could just be the duct running thru a cold space chilling off.duct sealer in a gallon......... paint it on around the joints then wrap thoses returns.

biggles is online now   Reply With Quote
Old 12-13-2008, 11:54 AM   #3
Newbie
 
Join Date: Dec 2008
Posts: 4
Default

Outside air getting in through returns?


Here's a pic:
Klamath is offline   Reply With Quote
Old 12-13-2008, 05:06 PM   #4
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,615
Default

Outside air getting in through returns?


going along the carpet there if you slide your hand on the top of those 3 openings that is the start of the return duct work and above that it is open to the space between the walls...........WOOOOO .heavy duty cardboard will do it for now.you can make up a box to fit in that opening(tight) with the bottom cut out(return to unit)and an opening(facing out to you) to fit that return grill when you slide it in.if your returning space temps at 65F-70F and that space gets 40F-50F in the winter your furnace will have to heat the difference in the lower temp and run longer to make your setpoint.pre-cut a piece of that cardboard to drop in above that opening(pre-box install)then remove it and cut an opening 1/2 smaller then the opening going down....this will give you like a gasket form when you push the cardboard box in.insulation above the box wouldn't hurt pack the WALL cavity opening.....up one side across the opening and back down just behind the opening then slide your box in.this is a quck fix for now to keep the wall temps from mixing with your true space return back to that furnace.sheet metal,wood...soft pine...in the furture
biggles is online now   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
moving heat runs/cold air returns hancam68 HVAC 9 09-05-2008 12:49 PM
Re-routing cold air returns fjmb031507 HVAC 2 10-05-2007 10:07 PM
Reducing size of very large air-vent returns in floor? AllGoNoShow HVAC 3 09-19-2006 09:36 PM
Gable Roof returns crecore Carpentry 2 11-02-2005 10:25 PM
Cold air returns (or lack thereof...) Umby HVAC 7 07-06-2005 10:24 AM




Top of Page | View New Posts

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