6
Note, if the Actual Measured CFM is not enough, the installer may need to increase the duct size or add
a booster fan if necessary. Ensure there is no blockage in the ductwork first.
9. MAINTENANCE
CAUTION: BEFORE CARRYING OUT ANY MAINTENANCE OR SERVICING, ENSURE THE UNIT IS
DISCONNECTED FROM THE MAIN ELECTRICAL SUPPLY.
S&P recommends inspection of the MD6 and ES24V at least once every twelve (12) months. To
inspect the unit disconnect from electrical supply. Remove the MD6 motorized damper from the fresh
air ductwork and inspect the damper blade for damage and proper function. If any debris is evident on
the damper blade clean with a damp (not wet) cloth. DO NOT USE any detergents or abrasive materials
for cleaning. Reinstall MD6 motorized damper to the fresh air ductwork and reseal joints.
Airflow / Air Velocity Reference Table
Airflow
(CFM)
Duct Size (in)
6
7
8
Air Velocity (FPM)
30
153
112
86
40
204
150
115
50
255
187
143
60
306
225
172
70
357
262
201
80
407
299
229
90
458
337
258
100
509
374
286
110
560
412
315
120
611
449
344
130
662
486
372
140
713
524
401
150
764
561
430
160
815
599
458
170
866
636
487
180
917
674
516
190
968
711
544
200
1019
748
573
