A type of power necessary for some direct heating equipment to operate. These units usually have a transformer that “steps down” the standard household current to operate the heater.
AFUE (Annual Fuel Utilization Efficiency)
The ratio of annual output energy to annual input energy, which includes any non heating-season pilot input loss and does not include electric energy.
The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) is the trade association representing manufacturers of air conditioning, heating, commercial refrigeration, and water heating equipment. An internationally recognized advocate for the industry, AHRI develops standards for and certifies the performance of many of these products.
The American National Standards Institute (ANSI) is a private, non-profit organization whose mission is to enhance U.S. global competitiveness and the American quality of life by promoting, facilitating, and safeguarding the integrity of the voluntary standardization and conformity assessment system.
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) is a non-profit technical organization whose members influence the direction of heating, ventilation, air-conditioning and refrigeration (HVAC&R) technology by creating industry standards and recommended procedures and guidelines, developing research, and writing technical information.
A device that assists in moving air through or away from heater and into area being heated.
BTU (British thermal unit)
Amount of heat needed to raise one pound of water through one degree Fahrenheit.
Chimney liner system
A system of venting material that properly sizes an existing chimney, allowing gas heating equipment to be vented into the chimney, which enhances proper operation and venting.
A process of heat transfer through a gas or liquid by bulk motion of hotter material into a cooler region.
This kit allows the conversion of a gas valve from one gas (Nat to LP or LP to Nat) to another.
Tests products for compliance to national and international standards and issues certification marks for those products.
Direct vent wall furnace
A system consisting of an appliance, combustion air, and flue gas connections between the appliance and the outdoor atmosphere, and a vent cap supplied by the manufacturer and constructed so all air for combustion is obtained from the outdoor atmosphere and all flue gases are discharged to the outdoor atmosphere.
DOE (Department of Energy)
A United States government agency which addresses U.S. energy, environmental, and nuclear challenges through transformative science and technology.
The general term for the passages and conduits through which flue gases pass from the combustion chamber to the outer air.
A burner that depends on the draft induced by a fan for its proper operation.
An HVAC load calculation manual used in the industry to help determine the amount of BTU’s necessary to heat an area.
This system uses dissimilar metals to create a spark for ignition which will operate as long as there is a flame that impinges the power pile generator creating adequate energy to open and close gas valve to satisfy the stat.
NFPA (National Fire Protection Association)
A worldwide leader in fire, electrical, building, and life safety. The mission of the international nonprofit organization founded in 1896 is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating consensus codes and standards, research, training, and education.
National Fuel Gas Code, the safety benchmark standard for fuel gas installations and venting of gas appliances.
Rear register kit
An accessory for a conventional vented unit that allows a unit to provide heat to another area by accessing the back portion of the heater with the kit.
Side outlet register
An accessory for a counterflow vented unit that provides heat to another area by attaching the side of the heater with the register to the adjacent area to be heated.
Vent extension kit
Vent materials for direct vent units that allow unit to be installed on walls that are thicker than standard wall thickness.
The fitting vent cap at the end of the vent pipe that directs the flue products to the outdoor atmosphere and protects against downdraft.
Vented wall furnace
A self-contained vented appliance complete with grilles or equivalent. It is designed for incorporation in or permanent attachment to the structure of a building and for furnishing heated air circulated by gravity convection or by a fan directly into the space to be heated through openings in the casing. Such appliances shall not be provided with duct extensions beyond the vertical and horizontal limits of the casing proper, although boots no more than 10-inches beyond the horizontal limits of the casing may be permitted to extend through walls of nominal thickness.