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Air Flow Balancing using the Door Ports FC155HRV & FC200HRV only
Door balancing ports (not on all models) are designed to be used in
conjunction with a Magnehelic Gauge or Digital Manometer to
measure the Stale and Fresh airflows for balancing.
Step 1
Prepare the air flow measuring device (i.e. Magnehelic Gauge or
Digital Manometer) by connecting the hoses to the low and high
pressure side of the gauge.
Step 2
Insert the hoses into the rubber fittings from the optional Door Port
Adapter Kit (part # 99-182). Use light pressure and rotate until
fitting is snug. Do not extend the hose past the rubber fitting.
Step 3
Open the HRV Door. Remove the 4 Door Port Covers by carefully
pushing them out from the back side of the door (use the blunt end
of a large drill bit etc.).
Step 4
Close the HRV Door. Initiate power and operate the HRV on high
speed. Operate the forced air system on high speed (if the HRV is
connected to the forced air system) .
Step 5
Insert the 2 rubber fittings from the gauge to the STALE AIR
Balancing Ports (upper right and lower left). Seal the FRESH AIR
Balancing Ports (upper left and lower right) with tape. Record your
reading.
Step 6
Insert the 2 rubber fittings from the gauge to the FRESH AIR
Balancing Ports (upper left and lower right). Seal the STALE AIR
Balancing Ports (upper right and lower left) with tape. Record your
reading.
Step 7
Refer to the "Airflow Reference Chart" for your model and
determine the FRESH AIR and STALE AIR flow rates (the chart is
located on the lower portion of this page).
Step 8
Damper down the higher airflow and repeat Steps 5 to 7 as required
until both airflows are identical (balanced).
Step 9
Remove the tape and rubber fittings and reinstall the 4 Door Port
Covers.
MODEL 200
0 230
153
156
Manometer
Reading
Airflow Numbers
(CFM)
(in. w.g.)
0.100 98 91
0.110 102 96
0.120 107 101
0.130 111 107
0.140 115 112
0.150 120 117
0.160 124 122
0.170
128 127
0.180 133 132
0.190 137 137
0.200 141 142
0.210 145 147
0.220 149 152
0 230
.
153
156
0.240 157 161
0.250 161 166
0.260
165 171
0.270 169 175
0.280
173 180
0.290 177 184
0.300 181 189
0.310
185 193
0.320 189 198
0.330 192 202
0.340
196 207
0.350 200 211
0.360
203 215
MODEL 155
0 180
142
129
Airflow Numbers
(CFM)
Pressure
(in. w.g.)
Fresh Air Stale Air
0.100 93 80
0.105 96 83
0.110 99 86
0.115 102 89
0.120 105 92
0.125 108 96
0.130 111 99
0.135 114 102
0.140 117 105
0.145 120 108
0.150 123 111
0.160 130 117
0.170 136 123
0 180
.
142
129
0.190 148 135
0.200 154 141
0.210 160 147
0.220 166 154
0.230 172 160
0.240 178 166
0.250 184 172
0.260 191 178
0.270 197 184
0.280 203 190
0.290 209 196
0.300 215 202
0.310 221 209
Pressure
Manometer
Reading
Fresh Air Stale Air
Magnehelic Gauge hoses connected to
STALE AIR balancing ports
Illustration of measuring STALE airflow using a Magnehelic Gauge.
Magnehelic Gauge hoses connected to
FRESH AIR balancing ports
Illustration of measuring FRESH airflow using a Magnehelic Gauge.
Fresh Air
B
alancing Ports
(top-left,
b
ottom-right)
S
tale Air
Balancing Ports
(top-right,
b
ottom-left)
Illustration of a door with door ports
Airflow Reference Charts
FC200HRV
FC155HRV