A combination gas valve is used to replace separate furnace components, such as a ____.

Which of the following statements regarding hot-surface ignition (HSI) systems is false?

A furnace that can vary its heat output along a scale that may range from 40% to 100% capacity is a(n) ____ furnace.

A furnace with an AFUE rating between 90% and 97% is a ____ gas furnace.

Which of the following statements regarding rollout switches is true?

As excess air increases, ____.

A(n) ____ humidifier uses its own heat source to create steam.

A device that may be used to detect combustion blower operation is a(n) ____.

Ultrasound may be used, or methylene blue dye may be injected  into the pedicle to stain the segment and identify the exact anatomical boundaries. These statements reflect a ________________ procedure.

This pediatric procedure is an abnormal opening between the trachea and esophagus.