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hope this help.

mpoon(无牌电工....)

How to fix it--- you may need to check to see, make your best guess, where is the hollow return passage going to. And follow it until you found any open spaces, where you can see the covered joist, 2x4, Stud cavities, in most case, builder used only thin gage sheet metal to cover the joist cavity. You can use duct tape seal all the gap where sheet metal and joist nailed together. (Actually. down in your basement you may be able to spot the thin sheet metal covered return passage)

How big the family room is?

Any windows, door?

How many floor air registers?

From my opinion, it is not a problem to cover the air return outlet any time, because the floor air register will create the air pressure, circulates the air in the family room. When blower fan is running.

(#4212864@0)
Last Updated: 2008-1-24
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枫下家园 / 美丽家居 / 今天发现family room墙壁上的风口有一个居然在往室内送冷风，其他墙上的风口都没这个问题。地面上的风口出的是热风。请问墙上的风口是回风的吗？墙上的一个风口出冷风，这种情况正常吗？非常感谢 -netmary(wii); 2008-1-20 (#4202097@0)

加一句，family room在车库上面 -netmary(wii); 2008-1-20 (#4202107@0)
放张纸在风口上试一试：吸住的是回风口，吹开的是进风口。墙上的风口一般是回风口。 -topremax(都是国人); 2008-1-20 (#4202180@0)

谢谢。刚才去试了，二楼过道上的和一楼的没有风出来，用纸头试也没吸住（也许是回风口风力不够大？），family room墙上这个明显感觉冷风在往室内吹。真是纳闷，难道是进风口？难道是直接从室外进风的？ -netmary(wii); 2008-1-20 (#4202208@0)

回风口 -ardes(昵称怎么没了); 2008-1-20 (#4202279@0)

这种情况正常否？ -netmary(wii); 2008-1-20 (#4202304@0)

no -akoei(停车**枫林晚); 2008-1-20 (#4202500@0)

请问是什么地方出问题？是炉子的问题吗？谢谢了。刚刚趁炉子启动，又去用纸头试了这几个墙壁上的风口，二楼过道的和1楼的风口把纸头吸住了，现在确定是回风口。就是family room这个，把纸头吹开了，还是冷风往室内吹。地上的所有风口都是暖风。 -netmary(wii); 2008-1-21 (#4204350@0)

我们家离暖气最远的bedroom需要至少2分钟才开始吹热风，一开始都是凉的。 -loneni(loneni); 2008-1-21 (#4205237@0)

谢谢回帖，但是我指的是墙壁上的风口，通常是回风口。再up一下看看能否有知道滴 -netmary(wii); 2008-1-22 (#4207535@0)

这样解释可以接受嗎?請指正 -mpoon(无牌电工....); 2008-1-23 {1413} (#4209915@0)
本文发表在 rolia.net 枫下论坛墙壁上的风口肯定是回风的,.
This type of air return passage, most of the builder do not use the real air duct, It uses the hallow space between the 2 dry wall and two 2 X 4, the space runs vertically that goes down to the family room floor, then turns horizontally on the garage ceiling.
On the top of the garage ceiling, it is also uses the space between two joist hollow space, and it runs to next return duct that leads to the basement furnace return plenum.
If the garage did not have a good insulation on ceiling, or the joist space did not seal well. The cold air will drift into the family room, especially in the cold and windy day, if outside air pressure is higher and get into the garage, the air pressure will drift into the family room,

Suggest you to make two simple testes in a windy day.
1: if family room have door. Close the family room door and the garage door. Then do the paper test, make note for how much air blow out form the outlet with all door closed.
2: 2nd test, with garage door open, family door open, and one of the house main door open as well. Also make note how many air blow out from outlet with paper.
If more air blow out on the 2nd test then the 1st, it is proven that, the hallow space for the air “return duct” is not seal 100 %.cool air gets into the hallow space, and the air flow to any space where have lower pressure.

The follow link have more info更多精彩文章及讨论，请光临枫下论坛 rolia.net
http://resourcecenter.pnl.gov/cocoon/morf/ResourceCenter/article//130

Thanks a lot. I'll make a test tonight. -netmary(wii); 2008-1-24 (#4211229@0)
very informative....thanks for sharing !! -jj999ca(jj999ca); 2008-1-24 (#4211261@0)
因为风不够大，所以今天没有测试。但是我觉得你说的非常有道理，而且前几天是比较寒冷刮风的天气。请教，如果是因为车库顶部及墙内密封不严，空气压力差，导致冷空气倒灌进室内，能够有简单一点的修复办法吗？可否在冬天刮风的时候将这个回风口堵上？谢谢了 -netmary(wii); 2008-1-24 (#4212808@0)

hope this help. -mpoon(无牌电工....); 2008-1-24 {781} (#4212864@0)
How to fix it--- you may need to check to see, make your best guess, where is the hollow return passage going to. And follow it until you found any open spaces, where you can see the covered joist, 2x4, Stud cavities, in most case, builder used only thin gage sheet metal to cover the joist cavity. You can use duct tape seal all the gap where sheet metal and joist nailed together. (Actually. down in your basement you may be able to spot the thin sheet metal covered return passage)

How big the family room is?

Any windows, door?

How many floor air registers?

From my opinion, it is not a problem to cover the air return outlet any time, because the floor air register will create the air pressure, circulates the air in the family room. When blower fan is running.

看样子比较难找泄漏点，因为咱家车库墙和顶都已经封上了*_* -netmary(wii); 2008-1-24 {121} (#4213197@0)
family room是开放式的，没有门，大窗户，大约23.5平方米的样子。不知这种情况除了带来一点冷空气外，是否还会产生其他负面问题？

don't warm car up in garage. garage celing have a access opening you may check there. -mpoon(无牌电工....); 2008-1-24 (#4213252@0)

@Baltimore

hope this help.

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