Asked by y912f

19. Changing the filter in a furnace or an air conditioner would be considered
a. a repair
b. a preventive maintenance measure
c. an adjustment
d. a diagnostic procedure

C?
Answered by Ms. Sue
I don't think it's c.

Answered by Ms. Sue
Yes. Changing the filter regularly protects the furnace parts from becoming clogged with dirt in the air.

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