Ductwork Sizing

Your home's heating and cooling system is just like your heart pumping blood to your organs and tissues, but in this metaphor, your heating and cooling unit is the heart, and your ductwork carrying warm and cool air is your veins delivering the blood. A clogged artery in the body from too many restrictions can lead to a heart attack, just like how in your home, having too small a return line, as well as improperly sized supply lines, restricted ductwork, and duct leakage can overwork your HVAC unit leading to early failure. Once our health problems are corrected, our breathing becomes easier and our pain goes away, just as correcting ductwork issues recaptures the lost capacity of your heating and cooling system, dramatically impacting your home's comfort and energy efficiency.
 
Common Problems:
  1. Supply air not able to cool a room
  2. Restrictions in the lines
  3. Duct leakage
  4. Under sized ductwork
  5. Weak airflow

Flex ductwork

Flex ductwork is common for Phoenix homes built in 1980 or later. This type of ductwork is super simple to install, however, best practices in duct design and installation are simply ignored. In addition, some flex ducts begin to split and crumble, and need to be replaced or spliced to remain at all functional.  
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Sheet Metal Ductwork

While sheet metal ductwork is better for airflow and durability than flex ductwork, homes built with sheet metal ductwork are plagued with undersized return lines and supply registers too close to the return.
Ductwork Repairs Include:
  • Repair any major duct system deficiencies identified; examples include disconnected, crushed, restricted or poorly supported ductwork.
  • Seal all electrical and refrigerant penetrations through equipment.
  • Mechanically fasten and seal the connection between the air handler and plenums.
  • Mechanically fasten and seal all supply and return plenum seams and end caps.
  • Mechanically fasten and seal the connection between take-off collars and the supply and return plenums.
  • Mechanically fasten and seal the inner liner of all supply and return ducts to take-off collars.
  • Mechanically fasten and seal all duct-to-duct connections, seams, sectioned metal elbows, branch T's, Y's and L's.
  • Mechanically fasten and seal inner liner of all supply and return ducts to supply boots and return boxes. The inner liner may be sealed from inside the living space.
  • Insulate any exposed ductwork and replace any insulation removed or pulled aside.
  • Ensure all supply boots are fastened to framing material with screws or roofing nails.
  • Seal all gaps between the subfloor, wall or ceiling and the supply boots and return boxes.
  • Seal all seams of each supply boot and each return box.
  • Seal all panned returns and return air chases from lower floor walls to the attic.
  • Seal all equipment platforms in closets or garages.
  • Duct static readings are recorded both before and after any duct repairs.

Live Comfortably. Live Healthy. Live Happy.

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TRANE VARIABLE SPEED SYSTEM INFORMATION

The Keck Family, Phoenix, AZ
It was so nice to find contractors who actually went that extra step for us. I have never had a more pleasant experience with any contractor than with David and your crew at Green ID.

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