Modern oil burners have a primary control that uses which of the following methods to prove burner ignition?

Repair work on HVAC equipment must not alter the nature of the appliance or equipment in violation of the listing and label.

Which of the following conditions will occur if the airflow is restricted on either the supply or return side of the blower?

When gas pipe passes through an outside wall, it must be

The IFGC applies to the installation of all ________

Using the multiple appliance vent tables, determine the furnace vent connector capacity for the illustration above.    (Use single-wall connector pipe if applicable)

The maximum operating pressure for piping systems located inside buildings shall not exceed ________ psig

Which of the following best describes the results of an increased heat load on an air conditioning evaporator?

Unless an exception applies, appliances are not allowed in

Natural gas is made up primarily of (CH4) methane, is colorless, tasteless and odorless and lighter than air. it has a flamability range of approximately _________ % volume in air