Airflow

Consonants are speech sounds produced by obstructing or restricting the airflow in the vocal tract.

COPD, chronic obstructive pulmonary disease, blocks airflow through the lungs.

The new home is more than one-thousand square meters. Work crews used almost ninety-one-thousand kilograms of steel to build it. About one-fifth of the steel is covered with a chemical that kills bacteria, mold and other organisms. A Massachusetts company, AgION Technologies, produces the chemical. The heating, airflow and cooling systems all are made with the treated steel. So are food preparation surfaces and other "high-touch" areas, along with the roof.