Oil burner nozzles are also selected on the basis of the spray angle they produce

Cast-iron head burners that had an efficiency rating of only about _______:

Install the main manual gas shutoff valve on the riser at least _______ above the floor level

70° to 90° spray angles are recommended for ________ combustion chambers:

A draft hood is used to ensure the maintenance of constant lowdraft conditions in the combustion chamber with a resultant stability of air supply

A yellow flame indicates dependence entirely on ______ air for combustion

The inlet of the first stage is located ________the inlet for the second stage

______ on pipes and pipe fittings should be located by spreading a soap solution over the surface:

A major advantage of a ________ fuel unit is that all air is eliminated from the oil being delivered to the nozzle

Single-stage pump recommended up to a ________ vacuum:

The burner tube of an ________ is commonly a straight, adjustable venturi that extends horizontally from the unit

The _______ is the most effective type of primary safety control used on oil burners

The _______ air is drawn into the burner by natural draft

In Pot type oil burners, the fuel oil is vaporized for combustion by heating it from _____

When the pressure gauge is attached to the nozzle line opening, it should indicate a reading of _______: