Which of the following is NOT an acceptable means of testing a smoke detector?

Testing a smoke detector is crucial to ensure its proper functioning and reliability in detecting smoke or fire. Smoke detectors are designed to respond to the presence of smoke particles or changes in air composition associated with fire.

Using smoke as a testing medium is the most common and effective method, as it directly simulates real-world conditions that the detector is designed to sense. Heat testing can also be used with certain types of heat detectors, but it's not applicable for smoke detectors, which do not respond to heat in the same manner.

The choice that is NOT acceptable for testing a smoke detector is fiber. Testing with fiber could potentially damage the detector or provide inaccurate results, as fibers do not represent any properties related to smoke and may not activate the sensor properly. Smoke detectors rely on specific air particles that are indicative of combustion, which fibers do not provide. Therefore, this method does not effectively or accurately assess the operational status of a smoke detector.