Blog

The weld all-around symbol indicates that a weld requires 100% joint penetration.

The series-loop system provides more uniform heat for a large area than a two-pipe system.

When a weld needs to be finished, a finish symbol is included with the ____ symbol.

In residential structures, the forced-air system is considered a closed-circuit system.

In a forced-air system, heat is always provided by burning natural gas.

What was the name given to the one-hundred-hour land war involving over 500,000 U.S. troops and another 200,000 from twenty-seven other countries, which expelled Iraqi forces from Kuwait?

Most heating and cooling systems provide a means of filtering the air that flows through the system.

Match the following HVAC equipment symbols to the corresponding letters in the figure below.

A forced-air heating system transports air through ducts.

The three basic types of heating systems are forced-air, hydronic, and electric radiant heating.