Jamieson, Fausset and Brown on 2 Kings 1:2-8

2-8. Ahaziah fell down through a lattice in his upper chamber--This lattice was either a part of the wooden parapet, or fence, which surrounds the flat roofs of houses, and over which the king was carelessly leaning when it gave way; or it might be an opening like a skylight in the roof itself, done over with lattice-work, which, being slender or rotten, the king stepped on and slipped through. This latter supposition is most probably the true one, as Ahaziah did not fall either into the street or the court, but "in his upper chamber."

inquire of Baalzebub--Anxious to learn whether he should recover from the effects of this severe fall, he sent to consult Baalzebub, that is, the god of flies, who was considered the patron deity of medicine. A temple to that idol was erected at Ekron, which was resorted to far and wide, though it afterwards led to the destruction of the place (Zec 9:5; Am 1:8; Zep 2:4). "After visiting Ekron, 'the god of flies' is a name that gives me no surprise. The flies there swarmed, in fact so innumerably, that I could hardly get any food without these troublesome insects getting into it" [Van De Velde].