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I thought of blocking ONLY the upper grille inlets on mine. I'd at least leave the lower ones open even with closing the uppers and bumper inlets.
Just some FYI:
Came across some info (needs verification) that CUMMINS maintenance shows 60F a minimum ideal air inlet temperature.
On big trucks we used winter fronts, but were adjured to NEVER block fan airflow (about a 12" diameter circle ahead of that device).
Let us know how readings go, in town versus steady-state highway, loaded and unloaded.
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