On the other hand, no one stepping aboard a newly developed rocket ship can realistically expect a level of risk as low as that of commercial air travel. (discovermagazine.com)
We're handling a case right now where a truck driver delivered a load of commercial air conditioning units. (colson.com)
The programme covers technical knowledge and practical skills in relation to residential and light commercial air conditioning, including installation, servicing and maintenance. (education-today.co.uk)