If your furnace blower continues to run while the burners remain off

or localized air leaks during a combustion analysis

requiring technician verification

it includes the necessary slots for the standard two-screw mounting configuration

007" Restrictor Coupling engineered for critical flow regulation within pneumatic control systems

Nu-Calgon 4320-W8 Acid Test Kit If your furnace blower continuesThe Nu Calgon 4320 W8 Phase III Acid Test Kit is a critical diagnostic tool for field technicians to quantify acid contamination in HVACR systems. Unlike basic indicators, this kit utilizes phase separation technology to provide a clear, undeniable color change in the acid indicator layer, eliminating guesswork during service calls. As the direct replacement for 064427, it is engineered for universal compatibility with mineral oil, alkylbenzene, and