1.   Among other problems, there was a round hole where the canvas was cut out to install a heating duct.

2.   And homes with forced hot-air heating ducts can pick up fumes from the pesticide and spread them through the house.

3.   Back-seat passengers also have their own large heating ducts and polished wood writing tables that fold from the back of the front seats.

4.   But there is hope, and those heating ducts are a clue to the trans- mission of the sound from basement to upstairs.

5.   Growth was quickest at the industrial group, which makes heating ducts.

6.   If one of the rooms has more than one heating duct, you might try closing off the duct in the common wall.

7.   Leaky heating ducts allow hot air to spill into the attic and pull cold air into the heating system.

8.   Now I want to put in air conditioning, using the same heating ducts.

9.   The best way to evaluate the efficiency of a heating duct system is to have a heating specialist run a flow hood or blower door test on the ductwork.

10.   The ceiling was ripped out to reveal the beams and heating ducts, which have been sprayed with a suitably industrial gray.