In Texas...
(w) Specific limitations for ducts and vents. The inspector is not required to do the following:
(1) determine the efficiency, adequacy or capacity of the systems;
(2) determine the uniformity of the supply of conditioned air to the various parts of the structure;
(3) determine the types of materials contained in insulation, wrapping of pipes, ducts, jackets, boilers and wiring;
(4) operate venting systems unless ambient temperatures or other circumstances, in the reasonable opinion of the inspector, are conducive to safe operation without damage to the equipment; or
(5) operate a unit outside its normal operating range as reasonably determined by the inspector.
"And remember my sentimental friend......that a heart is not judged by how much you love, but by how much you are loved by others" - Wizard of Oz.