Dealer Installation Instructions
Forced air handler/furnace system with an HRV/ERV:
This application provides filtration of all Outdoor Air (OA) that is brought into the home through the HRV/ERV, thus reducing the introduction of dust, pollen and mold from the outdoor air. For systems that have HRV/ERV units installed, we recommend ducting the ‘fresh air’ outflow from the HRV/ERV into the HEPA system. If the HRV/ERV CFM (cubic feet per minute) rating is lower than that of the HEPA system, an additional return needs to be installed into the HEPA system. The outflow air from the HEPA system then needs to be installed into the main return of the air handler/furnace system. Ensure that you follow the proper installation instructions as outlined in the HRV/ERV Installation manual(s).
Preparation:
Here are some things to consider as you decide where to install the HEPA system with an HRV/ERV.
Location:
•Make sure there is room to open the HEPA filter access panel for filter changes/inspections.
•Keep the HEPA system in a location where you can still access the air handler/ furnace filter.
•Keep the HEPA system away from possible water damage
•Vibration pads will reduce vibration for installations where the unit is placed on the floor.
•Install HEPA System on floor or suspended platform. If the unit is suspended, screws must not penetrate through the cabinet. Make sure that you have the proper chains/straps/joists and equipment to keep unit secure.
Intake (Marked as ‘Air In’ on unit):
•Most HRV/ERV systems will not move as much air as the HEPA system. For these systems, install an additional return from another treated air source into the HEPA system.
•If using an additional return duct, it should be installed upstream of any humidifiers. The fresh air outflow of the HRV/ERV should be “Y” connected to the additional return duct then connected to the inlet of the HEPA system.
•The additional return duct (if any) should be installed at least 6 ft. away from the outflow duct on the main return.
•Duct both the HRV/ERV and the additional return into the intake of the HEPA system.
Outflow (Marked as ‘Clean Air Out’ on unit):
•Outflow duct should be installed as close to the air handler/furnace inlet as possible but not directly into the return air elbow of the main return.
Ducting:
•If HEPA system is installed where inlet and outflow collars face down, metal elbows must be connected to both inlet and outflow collars.
•Each connection must be sealed with aluminum tape or mastic, including all take offs.
•If duct is exposed to unconditioned air, externally insulated flex duct is highly recommended.
•Externally insulated flex duct can also be used for noise reduction purposes.
•For best indoor air quality, do not use ductboard or fiberglass inside of ducts.
Electricity:
• The unit must be plugged into a grounded 120V, 60Hz outlet.
Required Materials for Installation of Unit:
Items for 350
Flex or rigid duct (length as required) | 8” round & 6” round |
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Takeoffs | One 8” & One 6” |
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Items for 675 |
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Flex or rigid duct (length as required) | 10” round & 8” round |
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Takeoffs | One 10” & One 8” |
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All Models |
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Aluminum tape or mastic as required |
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Misc. hanging materials - field provided |
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NOTE: Be sure to review ‘Rules for Safe Installation and Operation’ on page 1 of this document before
HRV/ERV
Example of Return to Return Installation with an HRV/ERV
For homes with a forced air handler/furnace sys- tem and an HRV/ERV system.
Additional Return
Air Handler/Furnace
Air Handler/Furnace Filter
HEPA System
NOTE: This filtration system is an ADDITIONAL filter, and does NOT replace the existing air handler/furnace system filter.
Installed duct runs should be as straight as possible (if the duct runs are too long, reduced CFM may result).
