return air

Reply

  #1  
Old 07-17-19, 03:37 AM
Member
Thread Starter
Join Date: Jan 2017
Location: USA
Posts: 494
Upvotes Received: 1
return air

Does it matter which side of the furnace on which the cold air return enters. Mine enters the side with the blower motor in the squirrel cage. Does this make the furnace noisy? Is there a preferred side or bottom?
 
Sponsored Links
  #2  
Old 07-17-19, 04:42 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 7,033
Upvotes Received: 40
Usually the cold air return does in fact enter from the side at the bottom of the furnace plenum where the motor and belts are located, up through to the heat exchanger where the burner uses outside combustion air (usually from outside the house) and passes the heat to the returned air. Keep in mind the air filter does not filter the air you breath but only protects the furnace mechanism from large particulate debris like cat and dog hair. You do not need high priced filters for a furnace filter.

See the following diagram.



Will the location make a difference in noise? Depends on the make and model of the furnace. They all make noise. Will you hear it in the upper floors? Yes. Most catastrophic furnace failures are due to a cracked heat exchanger and or burner corrosion. Other part failures are repairable and usually worth repair.
 
  #3  
Old 07-17-19, 05:21 AM
Member
Join Date: Sep 2017
Location: USA
Posts: 47
Upvotes Received: 1
“Keep in mind the air filter does not filter the air you breath but only protects the furnace mechanism from large particulate debris like cat and dog hair. You do not need high priced filters for a furnace filter.”


While I trust what you say is true, I thought removing particulates from the household air would be beneficial to people.
 
  #4  
Old 07-17-19, 05:49 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 7,033
Upvotes Received: 40
You can't expect a tiny little 1 inch thick filter located in the basement inside the motor section of the furnace to clean the air you breath. Think about it. Can't be done. If you need filtered breathable air you need to get a dedicated air cleaner. And that usually means a dedicated room also sealed from other rooms.

However, what I tell my customers, if if you have a dust problem or allergies then moving up to a better filter will help to a small degree. Otherwise I tell the customer to buy the cheapest filter and change check it every few weeks and plan on changing it at least every two months. Not the three months the manufacture recommends.

edit...
While I trust what you say is true, I thought removing particulates from the household air would be beneficial to people.
Think of it this way. If you don't have whole house A/C, but keep you windows and door open for air in the summer, look at the screen at the end of the season and see how much dirt and dust they accumulate. You're breathing that dust day in day out. Again how can a 16 x 25 x 1 fiberglass filter handle that?
 
  #5  
Old 07-17-19, 08:36 AM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 4,037
Upvotes Received: 68
Keep in mind the air filter does not filter the air you breath
moving up to a better filter will help to a small degree
Everybody is correct, the quality of the filter, and especially the length of time the furnace runs, make that a very small amount of improvement.
 
  #6  
Old 07-17-19, 03:24 PM
Member
Join Date: Nov 2011
Location: USA
Posts: 699
Upvotes Received: 2
I think return air is return air and it does not matter which way it comes from.Never noticed a difference in sound either but wasn't paying a lot of attention to that aspect.
 
  #7  
Old 07-18-19, 03:44 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 7,033
Upvotes Received: 40
I think return air is return air and it does not matter which way it comes from.
Well is does matter where it comes from. You want to use the already heated air in the house from the living area to be returned to the heat exchanger to be reheated. You don't want cold air or air from outside or air from an unheated room.
 
  #8  
Old 07-18-19, 05:16 AM
Member
Join Date: Nov 2011
Location: USA
Posts: 699
Upvotes Received: 2
I'm pretty sure we are talking where in the plenum box. Look it up.
 
Reply

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


Thread Tools
Search this Thread
Display Modes