When the length of quick-connect precharged line sets is altered, the charge will not normally have to be altered.

A good way to fasten acoustical lining to the inside of sheet metal duct is to use ____.

After refrigerant lines have been installed, they should be evacuated to a(n) ____ vacuum.

What two fasteners are used with fiberglass ductboard?

One drawback of using custom made, pre-fabricated duct sections is that ____.

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

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.