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

____ used at the end of a metal duct run will help reduce any noise that may be traveling through the duct.

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

A boot in a duct system is a fitting used ____.

The sun shining on the panels and coils of the condensing section will lower the efficiency of the unit.

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

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.

When hanging a horizontal air handler, it should be pitched toward the drain port for proper condensate removal.

What fastener is commonly used with round flexible duct?

The forced-air system is different from a natural-draft system, where the air passes naturally over the conditioning equipment.