Louvers and grills shall have a net free area of ____ for wood and ____ for metal

What type of vent is designed specifically for category I gas appliances?

Before working with chemical solvents, oils and refrigerants, the technician should review:

Heat that travels within a fluid such as air or water by means of currents would be defined as what type of heat transfer?

What is the area in square feet of a 15 inch round duct?

The input Btu rating of a gas furnace is 105,000 Btu. The gas heating value of one cubic foot of natural gas is 1030 btu. Calculate the cubic feet per hour of gas the furnace requires to operate. (Rounded up to whole numbers)

On a split AC system, the evaporator entering air temperature is 80°F and the leaving air temperature is 68°F, the technician knows that the system:

The anti-short-cycle time delay module:

Low pressure switches used in either refrigeration or air conditioning systems provide which of the following functions?

Suspended type unit heaters shall have a clearance from combustible materials of at least 18 inches at the sides and 12 inches at the bottom. How much clearance is required at the top if it has a vertical draft hood installed?