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Direct Duct System
Safety Warning
Some Building Code and Combustion Appliance Installation Codes do not allow location
of return air grills or any opening such as a breather ‘T’ in an enclosed room with spillage
susceptible combustion appliances. If combustion appliances are used, and not yet enclosed in a
room, locate the grill or breathing ‘T’ outside any future wall locations and a minimum distance
of 6 feet from the combustion appliance.
This method of installation is used primarily when it is not reasonable to install dedicated duct
runs from the HRV to the various rooms of the dwelling. In this installation the warm exhaust and
warm supply duct runs from the HRV are connected directly to the forced air heating system ductwork.
This method of installation does not permit source capture of the indoor air nor does it permit
room balancing.
Where required by local codes, the HRV/ERV supply duct may be directly connected to the
furnace return air duct. Where both the exhaust and the supply duct are installed into the return
air duct the exhaust air duct shall be positioned upstream at a distance of not less than 1 meter
(or 3 feet) from the supply duct. The supply duct shall be positioned as shown on the attached
drawing. In this application no opening such as a breather ‘T’ is used.
Also, where permitted by local codes, the HRV/ERV supply duct may be indirectly connected to
the furnace return air duct using a breather ‘T’. In this application, the breather ‘T’ in installed
into the HRV/ERV supply duct before the connection to the return air duct. Leaving a gap in
the ventilation supply duct in place of the breather ‘T’ is acceptable but not recommended. In
this installation, a grill is placed in the furnace return air duct and the HRV/ERV supply duct is
pointed at this grill at a minimum distance of 100mm (4”) but not greater than 300mm (12”).
The free area of the grill shall not be less than the free area of the supply duct. Call backs have
occurred because it was thought that something had been accidentally left out of the installation.
The Direct Duct System method of installation requires that the forced air system circulation fan
be operated when the HRV is in use. Furnace circulating fan may be interlocked with HRV.
Refer to Wiring Diagram. Please refer to fig. IV.
30 Inches
Minimum
FRESH
SUPPLY AIR
BREATHING ‘T’
FRESH
AIR IN
STALE
AIR OUT
fig. IV
Summary of Contents for Proventor II Series
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