11.   A good ventilation system requires vents near the roof peak and also vents closer to the eaves.

12.   A hospital that sees many TB patients will need specially designed ventilation systems and ultraviolet light to clean the air, as well as special masks for the staff.

13.   A special ventilation system constantly draws air into these rooms and sucks it out through a series of multimillion-dollar filters.

14.   A. If you are inside of your home, close the doors, windows, shut down the ventilation systems, for example.

15.   Actually, there was no confirmation that anthrax spores had been found in the ventilation system.

16.   Airbus jets have air conditioning packs under the center wing tank, but the design incorporates a ventilation system that cools the heated air given off by the units.

17.   But as a precaution, the building was closed to public tours Friday afternoon and the ventilation system was switched off.

18.   But an exemption was granted to bars and nightclubs in the hope that sophisticated ventilation systems could be developed to reduce the health risks.

19.   But EPA officials found anthrax spores on all three floors of the building, although not in the ventilation system.

20.   But that method of transmission is not as dangerous as more sophisticated ones that could have been used, such as contaminating our water supply or air ventilation systems.