InspectAPedia®

Photograph of  a 1930's supply duct in active use. Find & Fix Air Conditioning or Heating Supply Air Duct Leaks or Obstructions

  • SUPPLY DUCT AIR LEAKS - CONTENTS: Checklist for Finding HVAC Supply Air Leaks & Obstructions. Heating & Cooling Ducts - Supply Registers & Zones. Air Conditioning (or Heating) Duct Defects. The D'Arcy-Weisbach equation for pressure and head loss applied to HVAC ducts.
  • POST a QUESTION or READ FAQs about inadequate supply air in HVAC duct systems and its effect on heating or cooling air flow adequacy
  • REFERENCES
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Guide to heating & cooling duct work supply air flow adequacy, flow rate, temperature, and related problems.

This chapter of "How to Inspect the Central Air Conditioning or Cooling System" describes the inspection of heating and air conditioning (HVAC) duct registers & zones for defects such as missing air conditioning cool air supply or return air registers, undersized air conditioning duct openings, improper cooling duct routing, cooling (or heating) air duct corrosion, leaky air duct connections, defective heating or cooling ductwork materials such as Goodman gray flex-duct, some Owens Corning Flex-duct, and asbestos-containing air conditioning or heating duct work.

The photograph above shows a 1930's heating and cooling air supply register still in active use, but with leakage around the register which transmitted odors and mold from the building basement.



Green links show where you are. © Copyright 2017 InspectApedia.com, All Rights Reserved.

HVAC Supply Air Duct Leaks & Obstructions - Theory & Practice

Crimped cooling duct (C) Daniel FriedmanBlockages or crimps in HVAC ducts (photo at left) restrict air flow and in severe cases can cut it off entirely.

Leaks in HVAC cooling or heating air supply ducts mean that cooling or heating costs are increased, since the HVAC system needs to run longer to reach the desired indoor temperature and humidity.

[Click to enlarge any image]

Where more severe supply air duct leaks are occurring, some areas of the building or even the entire building may receive no heated or cooled air at all, even though the equipment is running.

List of Articles giving Procedures for Diagnosing HVAC System Air Leaks & Air Flow Problems

Below we list a catalog of common explanations for inadequate air flow from an HVAC duct system.

Watch out: But keep in mind that even this apparently accurate calculation of the effect of piping on air pressure and airflow loss will not include the effects of leaks or obstructions in the building return air or supply air duct system such as the following:

 


...


Continue reading at LEAKY DUCT CONNECTIONS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see AIR FLOW TOO WEAK

Or see AIR LEAK NOISES

Or see AIR LEAKs in SUPPLY DUCTS

Or see AIR LEAKS in RETURN DUCTS

Or see AIR FLOW IMPROVEMENT, HVAC

Or see AIR FLOW MEASUREMENT CFM - how to measure HVAC system air flow

Or see DUCT SYSTEM & DUCT DEFECTS - home

Or see ENERGY AUDIT STANDARDS for ENERGY RATINGS how HVAC system air leaks are measured & quantified

Or see INCREASING RETURN AIR

Or see REGISTER & DUCT LOCATION

Or see RETURN AIR FAQs

Or see RETURN AIR REGISTERS & DUCTS - home

Or see UNDERSIZED RETURN DUCTS

Suggested citation for this web page

SUPPLY DUCT AIR LEAKS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to ARTICLE INDEX to HVAC DUCT SYSTEMS

Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia


...

Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

Ask a Question or Search InspectApedia

Questions & answers or comments about inadequate supply air in HVAC duct systems and its effect on heating or cooling air flow adequacy.

Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Search the InspectApedia website

Comment Box is loading comments...

Technical Reviewers & References

Click to Show or Hide Citations & References

Publisher's Google+ Page by Daniel Friedman