An auxiliary drain pan under the unit is recommended when the evaporator is installed ____.

Oversized duct systems cost more to fabricate and install and will also result in the slowing of the air as it flows through the duct.

What fastener is commonly used with round flexible duct?

The atmosphere exerts a pressure of ____ at standard atmospheric conditions.

The simple way to check for airflow is to see if you can feel the airflow at a distance of about ____ from each register.

Duct systems can be plenum, extended plenum, reducing plenum, or perimeter loop.

One reason for using an extended plenum system is to ____.

The duct pressure equals the velocity pressure plus static pressure.

Airflow pressure in ductwork is measured in inches of ____.

To fasten a duct hanger strap to a floor joist, the nail used would be a ____.