When removing the rubber plugs from a line set, the hiss indicates that the tubing is not leaking.

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

The main drawback of the extended plenum system is that the velocity of the air is lower as the air reaches the last takeoffs on the extended plenum.

The pressure in a duct system is measured in ____.

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

A pin rivet must be installed in a properly sized, pre-drilled hole.

Perforated strap is a very versatile fastener as it can be used on all sizes of pipe.

To secure a flexible duct onto a duct collar, the best fastener would be a(n) ____.

The hole drilled in sheet metal for a tapping screw should be the approximate size of the ____.

For fastening a pipe strap to a cement wall, the nail used would be a ____.