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U.S.E.E.G. has noticed several code violations in its evaluations! When possible we
try our very best to educate our customers, and fellow tradesmen, to keep these issues from recurring. Below you will find
details on one of the most predominate violations we have encountered-- R-value of duct-work in an attic or garage. Wicomico County Building Code: Chapters R12 -
R24 MECHANICAL were replaced in 1989 to match the State of Maryland HVAC Code!
Annotated Code of Maryland Title 9 Chapter 15 states that Maryland HVAC codes must be in compliance with the International Mechanical Code (IMC) and the ACCA Manual "J" Residential Load Calculation! THE IMC STATES: (IN REFERENCE TO FIBROUS DUCT) 603.5 FIBROUS DUCT MUST COMPLY WITH NAIMA STANDARDS.
As shown in the chart above Salisbury, MD (The
only city from Wicomico County listed in the Manual "J") has a heating degree day listing of 4220.
By the NAIMA chart shown below, Salisbury, MD falls under "CLIMATE
ZONE II".
Many HVAC contractors are under the impression
that R 4.2 is sufficient for both attic and crawl space (or basement) duct install. THEY ARE
WRONG! PLEASE! If you are having new duct-work installed, or have had it replaced since 1989, check with the installing contractor to make sure the duct-work meets this code requirement! If for any reason your current, or previous, HVAC contractor is unavailable, or unwilling, to come out and/or check your records call U.S.E.E.G. for a FREE in home consultation. Improperly installed and under insulated
duct work could be costing you in energy consumption as well as shortening the longevity of your heating and cooling
system.
FOR MORE INFORMATION ON THIS AND OTHER CODES AND LAWS GOVERNING THE HVAC TRADE VISIT OUR LINKS PAGE AND LOOK UNDER CODES AND LAWS
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