What is it?

The DET test (Duct & Envelope Tightness Test) is a two step process for testing a home’s envelope tightness and the tightness of the home’s duct system. The new Georgia energy code adopted for 2011 requires that these two test be completed on all new construction homes and on any duct system where 50% or more of the duct system is disturbed or replaced during new equipment installation or duct improvements.

What does it involve?

A blower door test instrument is set up in an outside door way and operated to pull the home into a negative pressure where digital manometers are used to measure the amount of air leaking into the home and duct system. This measurement is checked against the code’s tolerances to verify that the home is as “tight” as required. A manual J heat load calculation is also performed during this phase of the test to ensure the correct size system has been installed in the home. Information from the Manual J load is also used to determine the allowable infiltration rate for the home.

Secondly, a duct blaster is connected to the central duct system through a return duct, all other return ducts and supply outlets are sealed and the duct system is tested under pressure to verify that the duct system is not leaking more air than allowed by code.

If a home fails to pass either or both of the tests, a report will be given to the owner outlining the needed repairs and costs to bring the home into compliance.

What does it cost?

Complete DET test with documentation
(Blower Door, Duct Blaster, Manual J, & Documentation)
DET test with documentation
(Blower Door, Duct Blaster & Documentation. Manual J provided by owner)
Duct system only
(Duct Blaster & Documentation)