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Direct Vent Equipment

Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Direct vent appliance installed

A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside

Publication Date

Mon, 02/04/2013 - 12:00

An oil-fired boiler with direct combustion air and exhaust venting

Publication Date

Wed, 02/25/2015 - 12:00

Gas-fired condensing boiler is installed as a direct vent appliance

This direct-vent condensing gas furnace has a fresh air intake.

Category IV oil-fired condensing boiler with direct vent pipe

A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust

Publication Date

Thu, 02/07/2013 - 12:00

Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented

Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside

Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC

Publication Date

Thu, 02/07/2013 - 12:00

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

For fireplaces that are not mechanically drafted or direct-vented to outdoors, total net rated exhaust flow of the two largest exhaust fans is .15 CFM per 100 sq. ft. of occupiable space when at full capacity

Fireplaces and Wood Stoves Have Proper Ventilation

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Combustion Furnaces

Guide describing combustion furnaces with selection and installation guidance.

Condensing Boilers

Guide describing condensing boilers and hot water heat distribution systems used for home heating.

Gas-Fired Boilers

Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.

Combined Space and Water Heating: Next Steps to Improved Performance

Author(s)

Bohac Dave,

Schoenbauer Ben,

Huelman Patrick H

Organization(s)

University of Minnesota,

UMN,

NothernSTAR,

NSTAR,

U.S. Department of Energy,

DOE

Publication Date

July, 2016

Report describing combined space- and water-heating (combi) systems using a high-efficiency direct-vent burner.

Oil-Fired Boilers

Guide describing oil-fired boilers and hot water heat distribution systems used for home heating.

Steam System Balancing for Multifamily Existing Buildings

Guide describing best practice venting strategies for existing steam heating systems in multifamily buildings.

The Habitat for Humanity of Metro Denver Zero Energy Demonstration Home

Author(s)

Habitat for Humanity of Metro Denver,

National Renewable Energy Laboratory

Organization(s)

NREL,

Habitat for Humanity of Metro Denver

Publication Date

April, 2008

Case study describing a Habitat for Humanity zero net energy home in Denver.

Evaporative Cooling Systems

This guide describes evaporative cooling technologies which can be used to cool homes in dry climates.

Rooms Containing Fuel-Burning Appliances - Code Compliance Brief

An entirely new section in the 2015 IECC/IRC regarding fuel-burning appliances basically requires the appliance to be isolated from the building thermal envelope, located either outside or within a separate room if the fuel-burning appliance is supplied by open combustion air ducts. This brief provides an overview of the requirements and further details of approving the actual "room".

Integrated Heating and Hot Water with Tankless Gas or Electric Water Heating

Guide describing installation procedures for combined space and water heating systems.

Pre-Retrofit Assessment of Existing HVAC Systems

Information guide describing considerations for before retrofitting HVAC systems, retrofit scope considerations, and HVAC system replacement options.

Evaporative Cooling - Code Compliance Brief

This brief discusses the provisions in the 2015 International Energy Conservation Code (IECC) and International Residential Code (IRC) related to evaporative cooling.

Thermostatic Radiator Valves on Steam Heating Systems

Guide describing how to analyze boiler and building performance and install thermostatic radiator valves (TRV) to reduce temperatures in over heated spaces.

No Kinks or Sharp Bends in Flex Duct Installation

Guide outlining how to correctly install flex ducts without kinks or sharp bends.

Sealed and Insulated Flex Ducts

Guide describing how to air seal and insulate flex ducts.

Sealed and Insulated Metal Ducts

Guide describing how to air seal and insulate metal ducts.

Outdoor HVAC Equipment Elevated and Secured for Resistance to Floods, Earthquakes, and High Winds

A guide describing how to elevate and secure HVAC equipment for protection against floods, earthquakes, and high winds.

Whole House Ventilation Strategies for Existing Homes

Guide describing how to select and install whole-house ventilation systems for existing homes.

Support at Intervals for Flex Ducts

Guide describing how to hang ducts with supporting straps or saddles to adequately support ducts so they do not sag and are not pinched or compressed in a manner that would cause damage to the ducts, the duct insulation, or the duct air barrier covering.

Direct Vent Equipment

Direct vent appliance installed

A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside

An oil-fired boiler with direct combustion air and exhaust venting

Gas-fired condensing boiler is installed as a direct vent appliance

This direct-vent condensing gas furnace has a fresh air intake.

Category IV oil-fired condensing boiler with direct vent pipe

A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust

Furnaces, boilers, and water heaters located within the home’s pressure boundary are mechanically drafted or direct-vented

Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside

Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

For fireplaces that are not mechanically drafted or direct-vented to outdoors, total net rated exhaust flow of the two largest exhaust fans is .15 CFM per 100 sq. ft. of occupiable space when at full capacity

Fireplaces and Wood Stoves Have Proper Ventilation

Combustion Furnaces

Condensing Boilers

Gas-Fired Boilers

Combined Space and Water Heating: Next Steps to Improved Performance

Oil-Fired Boilers

Steam System Balancing for Multifamily Existing Buildings

The Habitat for Humanity of Metro Denver Zero Energy Demonstration Home

Evaporative Cooling Systems

Rooms Containing Fuel-Burning Appliances - Code Compliance Brief

Integrated Heating and Hot Water with Tankless Gas or Electric Water Heating

Pre-Retrofit Assessment of Existing HVAC Systems

Evaporative Cooling - Code Compliance Brief

Thermostatic Radiator Valves on Steam Heating Systems

No Kinks or Sharp Bends in Flex Duct Installation

Sealed and Insulated Flex Ducts

Sealed and Insulated Metal Ducts

Outdoor HVAC Equipment Elevated and Secured for Resistance to Floods, Earthquakes, and High Winds

Whole House Ventilation Strategies for Existing Homes

Support at Intervals for Flex Ducts

Creating a Cool Room for Extreme Heat Events

Ventilation and Exhaust Strategies for Multifamily Housing

Ductless (Mini-Split) Heat Pumps

Ducted Returns

Air Conditioning

Traditional Split Heat Pumps