Product Manual

1. Determine square footage of house living space on left hand column.
2. Pick desired air change rate from top row.
3. Locate intersection of these points to determine constant CFM that should be obtained to meet desired ACH.
The EXCHANGER will provide 180 CFM with both fans and 90 CFM with one fan operating. Where the CFM delivery of the
XCHANGER exceeds that listed in Table 1, a standard plug-in wall timer can be set so the XCHANGER is cycled to obtain the
desired ACH or Tjernlund’s optional SCP speed control may be used.
EXAMPLE
3000 square feet of living space
.2 ACH desired ventilation rate equals 40 CFM
XCHANGER capacity of 90 CFM (with one fan running)
In this example the plug-in timer may be set so that the XCHANGER operates for one half hour straight each hour or two fifteen
minute periods each hour.
RECOMMENDED INSTALLATION LOCATION
The XCHANGER may be mounted anywhere in the house. The best place to mount it is the basement through the rim joist on top of
the foundation wall.
WARNING: Do not exhaust air from mechanical room unless makeup air is also supplied or equipment in mechanical room is sealed
combustion. Carbon monoxide poisoning may result. An optional duct take-off kit is available so exhaust can be removed
from outside the mechanical room if necessary.
It is recommended that the XCHANGER be installed in a location where it will not be directed at the occupants or interior water pipes.
Do not terminate adjacent to thermostat. Outside temperatures can disrupt normal thermostat operation.
Do not terminate within three feet from a barometric draft control or intake grille of a heating appliance.
XCHANGER HOOD TERMINATION CLEARANCES
3
DIAGRAM A
TABLE 1