A furnace located in a bedroom closet requires combustion air. What is the most common compliant solution for this confined space?
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A
Installing a larger return air grille in the closet door
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B
Providing two openings connecting to the outdoors or to adjacent spaces with adequate volume
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C
Using a sealed-combustion (direct-vent) appliance that draws combustion air from outside
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D
Leaving the closet door open during furnace operation