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f) Clothes dryer off, (if vented to the outdoors)
g) Furnace, hot water heater, (non direct vent) are turned off.
h) All other exhaust fans are off.
i) Ensure that HRV filters and core are in place and integral balancing dampers
are wide open.
j) Power up HRV and set to high speed.
k) Adjust all branch tech grills and registers to desired air flows.
l) After taking readings at both the stale air being exhausted and the fresh
air supply air stream, damper down the higher air flow stream with the
integral balancing damper to equal the lower volume air stream.
m) Once the air flows are balanced lock the balancing dampers in place.
n) While it is necessary to ensure that both air streams are balanced within
10% of each other, a near balanced condition should be possible.
o) Upon completion, return the fan speed selection to the normal speed of low.
A positive pressure situation within the dwelling may drive moist air into
the external walls of the dwelling where, in cold weather, it may condensate,
potentially causing structural damage.
A negative pressure within the dwelling may have severe undesirable effects.
In some geographic locations, radon gas may be drawn into the living space.
A negative condition may also cause back drafting of vented combustion
appliances such as fireplaces and furnaces.
When it is possible for excessive pressurization or depressurization of a dwelling
to occur it may be necessary to perform a House Pressure Test. This test is most
important where fuel fired devices are installed that are susceptible to spillage.
IT IS YOUR RESPONSIBILITY TO DETERMINE IF THE “HOUSE
PRESSURE TEST” IS REQUIRED.
