$99 for Dryer-Vent Cleaning from 3 Alarm Smoke Detector Services and Dryer Vent Cleaning ($199 Value)

Hampton Roads

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In a Nutshell

Company owned by firefighters prevent fire hazards by clearing lint from dryer vents and ensuring smoke detectors are working properly

The Fine Print

Promotional value expires 90 days after purchase. Amount paid never expires. Valid only within 30 miles of zip code 23464. Appointment required. Limit 1 per person, may buy 1 additional as gift. Limit 1 per household. Must use promotion value in 1 visit. All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

The Deal

  • $99 for a dryer-vent cleaning and smoke-detector inspection ($199 value)

Smoke Detectors: Fire Safety’s Two Technologies

Although smoke detectors may have different looks or sounds, most are triggered by one of two kinds of sensors. Read on for a breakdown of both types that may be found in your home. 

Ionization Detectors: A Half-Life That Saves Lives

The more common of the two, ionization smoke detectors harness a force that may seem counterintuitive to home safety: nuclear radiation. Inside the detector, a tiny particle of a radioactive isotope—typically americium-241—constantly generates radiation known as alpha particles. These particles interact with the oxygen and nitrogen atoms in the air to create ions with negative and positive charges, resulting in a small electric current. If any smoke particles reach the chamber, they immediately neutralize the ions and nullify the current, triggering the alarm. This style of alarm is more effective in detecting smaller smoke particles, which typically emanate from hot, fast-moving blazes fueled by highly combustible materials.

Photoelectric Detectors: Smoke as Mirrors

As the name suggests, photoelectric detectors rely on smoke’s interaction with light to trip the sensor. However, while it’s logical to think the detector senses when smoke blocks out a beam of light, it actually works because of smoke’s ability to deflect light. In this model, the sensor mechanism is typically a T-shaped chamber in which a constant beam of light traces across the top horizontal bar. A light sensor occupies the vertical leg, untouched by the perpetual beam above. When smoke drifts into the chamber and reaches the horizontal bar, it scatters the light, directing some beams into the light sensor and triggering the horn. This style is particularly adept at detecting the thicker smoke of slow-burning, smoldering flames such as those caused by a particularly heated sibling rivalry.

Customer Reviews

Definitely something that needs to be done at least annually or every 18months. Fantastic service
Queena N. · January 26, 2015

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