Trapped mucus can block airflow and become a breeding ground for germs.

The ice also forms on the inner walls of the carburetor, sometimes to such a degree that it blocks airflow to the engine.

Potential expansion methods include, make seats smaller as the Emirates Stadium is known for its spacious seats, filling in the dips in the corners of the stadium though this would block airflow, and replacing the current roof with a third level and building a new roof.

If you have been diagnosed with obstructive sleep apnea - a condition in which relaxation of the muscles around the tongue and throat causes the tissues to block airflow to the lungs while you sleep - there are a number of treatment options to discuss with your doctor.

An enlarged adenoid, or adenoid hypertrophy, can become nearly the size of a ping pong ball and completely block airflow through the nasal passages.

You may just need a cleaning to clear away any dust or debris that could be blocking proper airflow.

When reconnecting an air-conditioner, be sure that draperies or furniture do not block airflow in front of the grille.

Enlarged adenoids can become nearly the size of a ping pong ball and completely block airflow through the nasal passages.