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Conductor voltage drop = 3.6 voltsIR = 3.6 voltsR = 3.6 / 18 = 0.2 ohms
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The operating temperature of fire damper actuating device shall be approximately _____ above the normal temperature within the duct system
Supply air to a swimming pool and associated deck areas shall not be recirculated unless such air is dehumidified to maintain the relative humidity of the area at _____ or less:
Ducts shall be supported with approved hangers at intervals not exceeding _____ :
Venting systems shall be designed and constructed so as to develop a ______ flow adequate to convey all combustion products to the outside atmosphere:
Where ducts used for cooling are externally insulated, the insulation shall be covered with a vapor retarder having a maximum permeance of ______ perm:
The termination of chimneys or vents of mechanical draft systems equipped with power exhausters shall be located a minimum of ______ from the lot line or from adjacent buildings:
For a 300 ampere electrical circuit, what is the minimum size copper equipment grounding conductor as per NEC?
For determining all welded and brazed joints are liquid tight, a light test shall be performed by passing a lamp having a power rating not less than _____ through the entire section of duct work to be tested.
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:
Ferrous fan blades shall only be used for fans located within the ductwork and through which hazardous materials are exhausted.
If two 4 ohm resistors are connected in series which are powered by 240 volts power source, what is the current flow across one 4 ohm resistor?
Smoke dampers are not required in corridor penetrations where the duct is constructed of steel not less than _____ in thickness and there are no openings serving the corridor:
Ozone cabinets and ozone gas-generator rooms for systems having a maximum ozone generating capacity of 1/2 pound (0.23 kg) or more over a 24-hour period shall be mechanically ventilated at a rate of not less than ______ air changes per hour:
The pressure classification of ducts shall equal or ______ the design pressure of the air distribution in which the ducts are utilized:
When an electrical circuit tested with ohmmeter, a short circuit is indicated by a reading of _______