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Donald Hester
Washington State Licensed Home Inspector #647
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509-670-9572

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DonHester's blog

Kinky are you? Flex duct inspections

Submitted by DonHester on Sun, 01/27/2013 - 09:50.

 Kinky are you? Flex duct inspections Chelan Home Inspection Services


So kinky may be a relative term. One person’s kinkiness may be another person’s normal. I am not the one to judge.

But there are appropriate times for your kinkiness, kinky are you?

                                        Kinky are you? Chelan Home Inspections

When I am doing a home inspection I try to get a feel for how the HVAC system is performing. Do I have areas in the home that seem to have little to no air flow at the register. I make a mental note so when I am doing the flex duct inspection that I can look for any issues that may explain the lack of performance at a register.

Here we have a kinky little detail.

                               Kinked HVAC Duct      Wenatchee Home inspection

Duct installation should be performed in a manner to provide good air flow. Air is a fluid and as such is affected by friction, bends and restrictions like water.

The performance of your heating and cooling system will be greatly affected by a poor installation.

 

                                                     Duct bend radius  Wenatchee Home Inspection    

The bend radius at the center line of ducts should be equal to or greater than one duct diameter. The duct should not bend across a sharp corner of building materials such as joists or truss supports. Sharper bends increase pressure drop significantly and reduce airflow.
If a flexible duct is not fully extended, the friction rate increases proportionally with the compression. Care needs to be taken to minimize sagging or snaking of the duct between supports and minimize pressure loss.

Proper Duct extension Chelan Home Inspection              Friction rate of flex duct Wenatchee home inspection

Your systems performance will be dictated by many things but your ducts have one of the greatest influences on the system.


Flex-duct instillation guide

 

“If you think it's expensive to hire a professional to do the job, wait until you hire an amateur.”

Red Adair


NCW Home Inspections, LLC  is a Licensed Washington State Home Inspection service located in Wenatchee Washington serving Chelan County, Douglas County, Kittitas County, Okanogan County and Grant County Washington and the cities of Wenatchee, Leavenworth, Cashmere, Oroville, Cle Elum, East Wenatchee, Quincy and many more…  

Your Wenatchee and Chelan Professional Real Estate, Home and Structural Pest Inspection Service
www.ncwhomeinspections.com                                               509-670-9572

 

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