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One morning they discovered a boy curled up and sleeping in the heating ducts.

There is no room for heating ducts or kitchen islands.

She looked up, and saw a thick black stream moving into the heating duct.

The stream heading into the heating duct was stopped, but how many more of them were there?

From the ceiling and walls ran various heating ducts which carried the hot air to other parts of the structure.

Walls open for several months have now been closed following the installation of heating ducts.

He heard a fly buzzing deep in a heating duct.

We had to duck our heads as the guard led us under a big heating duct.

What may be the result of improperly installed heating ducts?

At age eight months, he was using a baby walker and fell into a heating duct on the floor of his house.