6.6202.6 Heat Recovery Ventilator and Energy Recovery Ventilator Installation in Single Dwelling Unit (All Building Types) | Standard Work Specifications for Home Energy Upgrades

Topic:

Whole Building Ventilation

Subtopic:

Components

Desired Outcome:

Heat Recovery Ventilator ( HRV HRV Heat recovery ventilator ) and Energy Recovery Ventilator ( ERV ERV Energy recovery ventilator ) systems installed to specifications

Note:

The authority having jurisdiction may require that a licensed professional perform certain tasks outlined in this detail.

For supporting material, see Referenced Standards.

Multifamily Homes

Title	Specification(s)	Objective(s)
6.6202.6a Equipment specifications	Specifications will be field verified as appropriate to site conditions by installer	Ensure appropriate equipment is specified Ensure design and installation are feasible
6.6202.6b Air flow	ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.2 and local code requirements should be followed for identifying design airflow rates within apartment dwelling units. All other areas will follow local code requirements and/or ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.1 requirements Air flows will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111 and adjusted to meet design requirements	Provide sufficient outdoor air to desired locations
6.6202.6c Wiring	Wiring will be installed by a properly licensed contractor Wiring will be installed in accordance with original equipment manufacturer specifications, and local and national electrical and mechanical codes Refer to NFPA NFPA National Fire Protection Association, www.nfpa.org 70: National Electrical Code for installation requirements	Prevent an electrical hazard
6.6202.6d Access	Fans, service switch Service switch An electrical switch that controls the complete flow of electricity to a mechanical device , filters, drain, and drain pan will be accessible for maintenance or replacement	Maintain designed air flows and system performance Ensure occupant health and safety
6.6202.6e HRV HRV Heat recovery ventilator / ERV ERV Energy recovery ventilator mounting	Fan will be mounted securely in accordance with manufacturer specifications and local code requirements (in terms of seismic restraints) Fan will be oriented so the equivalent length of the duct run is as short as possible Fan will be isolated from the building framing unless specifically designed to be directly attached	Ensure short duct runs achieve optimum air flows Ensure fan is mounted securely Ensure fan housing or building framing does not shake, rattle, or hum when operating Minimize noise
6.6202.6f Condensate drain	Condensation shall be drained to a location approved by the local jurisdiction	Prevent moisture problems
6.6202.6g Backdraft dampers (required for intermittent operation)	A backdraft damper Backdraft damper A damper that allows air to flow in only one direction will be installed between the HRV HRV Heat recovery ventilator or ERV ERV Energy recovery ventilator and the exterior, unless the system operates continuously	Prevent reverse air flow when the system is off
6.6202.6h Fan outlet termination	Minimum distance of exhaust outlet from any doors, windows, or outside air intakes shall be in conformance with the applicable building code Outlet will be sealed to prevent water intrusion and exhaust air leakage into building cavities	Direct exhaust to the outdoors and prevent re-entry Prevent entry of weather and pests into building shell Ensure occupant health and safety
6.6202.6i Intake location	Intake will be installed in accordance with the following: A minimum of 6" above grade A minimum of 10' from contaminant sources Above local snow or flood line A minimum of 18" above an asphalt-based roof Minimum distance between exhaust outlet and air intake will be 6' or in accordance with manufacturer specifications	Ensure occupant health and safety Prevent entry of contaminants Ensure unrestricted airflow
6.6202.6j Intake/exhaust fitting	Intake/exhaust fitting will have integrated collar that is at least the same diameter as the duct Fitting will be appropriate for regional weather conditions and installation location on exterior of building	Effectively draw the required volume of air from outside Preserve integrity of the building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier Ensure durable installation
6.6202.6k Weatherproofing	Exterior termination fittings will be flashed or weather sealed Water will be directed away from penetration Weatherproofing will be in accordance with manufacturer specifications	Prevent entry of weather into building shell
6.6202.6l Pest exclusion	Screen material no less than 1/4" and no greater than 1/2" hole size in any direction will be used at any exhaust and intake	Prevent entry of pests into building shell
6.6202.6m Duct connections	Ducts will be connected to applicable registers or grilles, collector box, HRV HRV Heat recovery ventilator or ERV ERV Energy recovery ventilator , intake fitting, and termination fitting Ducts will be connected and sealed in accordance with duct exhaust and supply duct detail	Achieve the desired air flows to and from the desired locations Preserve integrity of the duct system and building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier
6.6202.6n Duct layout for attachment to forced air systems	Exhaust air will not be taken from the forced air system Outdoor air supply ducts attached to the return side of forced air systems will be: Attached as close to the heating, ventilation, and air conditioning ( HVAC HVAC Heating, ventilation, and air conditioning ) system's fan as possible, while remaining in compliance with manufacturer specifications Connected to the outdoor air outlet from HRV HRV Heat recovery ventilator / ERV ERV Energy recovery ventilator system Filtration of ventilation air will be provided before reaching the HVAC HVAC Heating, ventilation, and air conditioning fan Connected and sealed in accordance with the supply duct detail	Achieve the desired air flows to and from the desired locations Preserve integrity of duct system and building Ensure occupant health and safety
6.6202.6o Duct layout for fully ducted HRV HRV Heat recovery ventilator / ERV ERV Energy recovery ventilator systems	All ducts will be connected and sealed in accordance with SWS 6.6004.2 Individual Exhaust Fan Serving Multiple Rooms Within a Single Dwelling Unit and SWS 6.6102.7 Ducts for Supply	Achieve the desired air flows to and from the desired locations Preserve integrity of duct system and building Ensure occupant health and safety
6.6202.6p Insulation	Outdoor air intake duct will be insulated from the outdoor air intake to the HRV HRV Heat recovery ventilator / ERV ERV Energy recovery ventilator system to a minimum of R-8 or equivalent to local codes Ducts installed outside of the thermal envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier will be insulated to a minimum of R-8 or equivalent to local codes	Preserve integrity of the duct system by eliminating condensation
6.6202.6q Register boot to interior surface seal	Register boot will be sealed to interior surfaces with sealants compatible to their intended surfaces Sealants will be continuous and meet fire barrier specifications	Prevent air leakage around boot Ensure a permanent seal to the building air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary Prevent a fire hazard
6.6202.6r Sealant selection	Sealants will be compatible with their intended surfaces Sealants will be continuous and meet fire barrier specifications	Ensure a permanent seal Prevent a fire hazard
6.6202.6s Balance and flow	Air flows will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111 and adjusted to match to the design specification	Achieve the desired air flows to and from the desired locations
6.6202.6t Fire dampers	Fire dampers must be accessible for inspection and/or testing by the local authorities; if fire dampers are not accessible from a grill or register, an access door in the ductwork is required Sealing activities will not interfere with the operation of fire dampers, balancing dampers, or backdraft dampers Type B fire dampers will be used as required by fire code	Ensure access to fire dampers for safe operation Minimize static pressure Maximize air flow
6.6202.6u Occupant/property manager education	Occupant/property manager will be educated on purpose of system, and also how and when to change filter and clean drain pan, if applicable, in accordance with manufacturer specifications	Ensure occupant health and safety Preserve integrity of system