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Heat Recovery Ventilator (HRV)

Video

Video describing the Cold Climate Housing Research Center heat recovery ventilator system.

An HRV or ERV provides balanced ventilation

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Karuna Passive House HRV Supply Register

Video

Video discussing the heat recovery ventilation (HRV) system in a passive house.

Wrong - The holes around the HRV ducting should be air sealed.

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Heat Recovery Ventilator (HRV) or Energy (Enthalpy) Recovery Ventilator (ERV)

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Right - Diameter measurement of small through-the-wall HRV unit; 4 of 14.

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Right - Example of a small through-the-wall HRV duct unit; 1 of 14.

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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

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Right - Fan end view of a small through-the-wall HRV unit; 2 of 14.

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Right - A hole is drilled into the wall for installation small through-the-wall HRV; 5 of 14.

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Right - A small through-the-wall HRV duct is installed in an exterior wall; 7 of 14.

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Right - An EPDM gasket is installed around an HRV duct installed in an exterior wall; 9 of 14.

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Right – Holes were drilled into the I joists between floors to run the small-diameter HRV ducts.

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Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.

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Right - A hand saw is used to remove wall material for a small through-the-wall HRV; 6 of 14.

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Right - Flaps are cut into house wrap installed over an HRV duct then taped out of the way to install flashing; 8 of 14.

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If integrating an ERV/HRV with the heating/cooling duct system, add dedicated ducts for either the supply or return side to prevent short-circuiting of air distribution

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Karuna Passive House Ventilation System

Video

Video discussing the heat recovery ventilation (HRV) system in a passive house.

Air Sealing Colorado Homes – 10.634

Reference

Fact sheet describing air-sealing concerns and remedies, including HRV/ERV installation, caulking, spray foam, and weatherstrip installation.

Outdoor Air Intake Damper Controlled

Guide

Guide describing how to install outdoor air intakes and connect them to the return side of the HVAC system, using controls installed to operate intermittently & automatically based on a timer and to restrict intake when not in use (e.g., a motorized damper).

Obvious Ventilation Controls

Guide

Guide describing how to install obvious ventilation controls for continuous and intermittent exhaust fans used for whole-house ventilation.

Whole-House Ventilation Strategies for New Homes

Guide

This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.

Whole-House Mechanical Ventilation System meets ASHRAE 62.2

Information Guide

This information guide describes the minimum ventilation requirements for a DOE Zero Energy Ready certified home.

Continuously Operating Ventilation and Exhaust Fans

Guide

Guide describing how to set controls on an exhaust fan for continuous operation.

Sealed and Insulated Flex Ducts

Guide

Guide describing how to air seal and insulate flex ducts.

Duct Leakage Testing for Central Exhaust and Ventilation Systems in Multifamily Buildings

Guide

Guide describing the testing of duct leakage in central ventilation systems for multi-story, multi-family buildings.

Sealed and Insulated Fiber Board Ducts

Guide

Guide describing how to air seal and insulate fiber board ducts.

Airflow Control in Elevator Shafts, Corridors, Stairwells, and Trash Chutes in Multifamily Buildings

Guide

Guide describing airflow control strategies for elevator shafts, corridors, stairwells, and trash chutes in multifamily buildings.

Properly installed ERV/HRV

Properly installed ERV/HRV

Heat Recovery Ventilator (HRV)

An HRV or ERV provides balanced ventilation

Karuna Passive House HRV Supply Register

Wrong - The holes around the HRV ducting should be air sealed.

Heat Recovery Ventilator (HRV) or Energy (Enthalpy) Recovery Ventilator (ERV)

Right - Diameter measurement of small through-the-wall HRV unit; 4 of 14.

Right - Example of a small through-the-wall HRV duct unit; 1 of 14.

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

Right - Fan end view of a small through-the-wall HRV unit; 2 of 14.

Right - A hole is drilled into the wall for installation small through-the-wall HRV; 5 of 14.

Right - A small through-the-wall HRV duct is installed in an exterior wall; 7 of 14.

Right - An EPDM gasket is installed around an HRV duct installed in an exterior wall; 9 of 14.

Right – Holes were drilled into the I joists between floors to run the small-diameter HRV ducts.

Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.

Right - A hand saw is used to remove wall material for a small through-the-wall HRV; 6 of 14.

Right - Flaps are cut into house wrap installed over an HRV duct then taped out of the way to install flashing; 8 of 14.

If integrating an ERV/HRV with the heating/cooling duct system, add dedicated ducts for either the supply or return side to prevent short-circuiting of air distribution

Karuna Passive House Ventilation System

Air Sealing Colorado Homes – 10.634

Outdoor Air Intake Damper Controlled

Obvious Ventilation Controls

Whole-House Ventilation Strategies for New Homes

Whole-House Mechanical Ventilation System meets ASHRAE 62.2

Continuously Operating Ventilation and Exhaust Fans

Sealed and Insulated Flex Ducts

Duct Leakage Testing for Central Exhaust and Ventilation Systems in Multifamily Buildings

Sealed and Insulated Fiber Board Ducts

Airflow Control in Elevator Shafts, Corridors, Stairwells, and Trash Chutes in Multifamily Buildings