Get To Know Your Air Flow

By
Home Inspector with Jay Markanich Real Estate Inspections, LLC

It is probably true that on half the home inspections I do the filter is installed backwards.  It is important that the filter be installed the right way!  Why?  Because one side is stronger and meant to handle the air flow's pressure.  There is an arrow drawn on every filter to tell you the air flow direction.  Put in backwards, and as it gets loaded with dust, the filter can literally get sucked into the system and even cause damage to the fan.

Someone took the time to draw which way the filter should be installed.

That way, when it is put into the slot, you only have to put the arrow on the filter in the direction of the arrows drawn on the return duct.

What if the arrows are drawn wrong?

THESE ARROWS ARE POINTING IN THE WRONG DIRECTION!!

How do you know which way the air blows?

The air will always be drawn TOWARD the blower.  From the blower it gets heated in the furnace or cooled on the AC coils.

So the air-flow arrows on the filter should point TOWARD blower.

This unit is 5 years old.  It was filthy.  The ducts in the house were filthy.  Could it be the bad information on the arrows contributing to that?

My recommendation:  If you don't know which way the air is blowing, put a piece of toilet paper on the end of a pair of pliers and stick it into the slot.  See which way the paper is drawn.  That is your air flow direction!  Don't believe me?  Check it yourself.  AND THEN DRAW YOUR ARROWS THE RIGHT WAY!

 

 

Posted by

Jay Markanich Real Estate Inspections, LLC  

Based in Bristow, serving all of Northern Virginia.

Office (703) 330-6388   Cell (703) 585-7560

www.jaymarinspect.com


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Re-Bloggged 19 times:

Re-Blogged By Re-Blogged At
  1. Maureen McCabe 08/20/2010 06:27 PM
  2. Vickie Slade 08/20/2010 07:49 PM
  3. Donald Bradbury 08/20/2010 09:11 PM
  4. Missy Caulk 08/21/2010 10:29 AM
  5. Laurel Stone 08/21/2010 10:42 AM
  6. Jeanne & Ralph Janisch ABR CRS Brokers 08/21/2010 11:12 AM
  7. Palm Properties l La Jolla Real Estate 08/21/2010 11:23 AM
  8. Damon Gettier 08/21/2010 03:32 PM
  9. Roy Kelley 08/21/2010 03:43 PM
  10. Barbara-Jo Roberts Berberi 08/21/2010 04:03 PM
  11. zeta cross 08/22/2010 08:30 AM
  12. Lyn Sims 08/22/2010 11:31 AM
  13. Jeanean and David Gendron 08/22/2010 12:14 PM
  14. Valerie Duncan Stewart 08/24/2010 09:25 AM
  15. Brandon Clark 08/25/2010 12:52 AM
  16. Jennifer Dulmaine 08/26/2010 10:11 PM
  17. Barbara Todaro 08/27/2010 03:19 AM
  18. Dan Edward Phillips 08/30/2010 11:16 PM
  19. Chris Smith 08/30/2010 11:40 PM
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Topic:
ActiveRain Community
Location:
Virginia Prince William County Bristow
Groups:
Active Rain Block Party
Adventures in Home Inspecting
Ask the Home Inspector
Professional Home Inspectors
The Vent
Tags:
air filter
dirty return ducts

Comments 64 New Comment

Rainmaker
1,170,553
Jay Markanich
Home Inspector - servicing all Northern Virginia
Jay Markanich Real Estate Inspections, LLC

Chris - the school of hard knocks can be a cruel teacher.  It is an effective one though...

August 31, 2010 05:56 AM
Rainmaker
821,459
Marc Swartz
CPA, CA - Toronto, Durham & York Regions, Ontario

Jay - In electronic air cleaners, the filter needs to be cleaned regularly.

August 31, 2010 07:29 AM
Rainmaker
1,170,553
Jay Markanich
Home Inspector - servicing all Northern Virginia
Jay Markanich Real Estate Inspections, LLC

Ideally monthly Marc.  On inspections when those are present I actually show the client how to do that.

August 31, 2010 07:31 AM
Rainmaker
260,368
Wayne B. Pruner
Tigard Oregon Homes for Sale, Realtor, GRI
Oregon First

This is good stuff Jay. Luckily I took Arrow Drawing 101 in college!

September 30, 2010 12:43 AM
Rainmaker
1,170,553
Jay Markanich
Home Inspector - servicing all Northern Virginia
Jay Markanich Real Estate Inspections, LLC

Well, Wayne, it sure would have come in handy here.  Did they do directions in the first or second semester?

September 30, 2010 07:55 AM
Rainmaker
1,170,553

Jay Markanich

Home Inspector - servicing all Northern Virginia
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