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19
Fig. 5
NOTE: PERFORM AIR FLOW BALANCING USING FAN CURVE “B” AT HIGH SPEED
Refer to the following conversion chart to determine CFM flow.
A positive pressure situation within the dwelling may drive moist air into the external walls where,
in cold weather it may condense, potentially causing structural damage.
A negative pressure situation 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 Depressurization 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 DEPRESSURIZATION
TEST” IS REQUIRED.
Supply Air Stream
Magnahelic Reading
CFM
Equivalent
.37
70
.38
80
.40
93
.42
112
.43
117
.44
127
.45
132
.46
136
.47
141
.48
146
.50
150
Exhaust Air Stream
Magnahelic Reading
CFM
Equivalent
.77
70
.72
80
.57
93
.44
112
.39
117
.32
127
.30
132
.26
136
.22
141
.19
146
.17
150
Cold Supply
Cold Exhaust
Warm Exhaust
Warm Supply
EXHAUST AIR STREAM
SUPPLY AIR STREAM
Summary of Contents for Proventor II Series
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