Which of the following flammable liquid having a flash point below 73°F (23°C) and a boiling point below 100°F (38°C)

Intake openings shall be located not less than 3 feet  below contaminant sources where such sources are located within _____ of the opening:

Ferrous fan blades shall only be used for fans located within the ductwork and through which hazardous materials are exhausted.

As per Department of Transportation (DOT) specification cylinders with a maximum water capacity of _____ shall be used for completely self-contained hand torches and similar applications

Ducts shall be supported with approved hangers at intervals not exceeding _____ :

Smoke detectors shall be installed in return air systems with a design capacity greater than _______ , in the return air duct or plenum upstream of any filters:

Where the vent vertical termination is located below an adjacent roof structure, the termination point of mechanical draft system shall be located at least _____ from such structure:

Venting systems shall be designed and constructed so as to develop a ______ flow adequate to convey all combustion products to the outside atmosphere: