Specification Sheet

260
MODEL SQD & eSQD
DIRECT DRIVE SQUARE INLINE CENTRIFUGAL DUCT FAN
Use the estimated pressure drop graphs to help select the proper fan that will deliver the desired
airow. Enter the graph from the bottom at the specied CFM and move vertically upward to the fan
curve for the desired size, then horizontally to the left and read the estimated static pressure drop
resulting from these typical accessory packages. Add the accessory pressure loss to the system (or
building) design static pressure loss to obtain the total static pressure loss to be used for the proper
fan selection.
Use the estimated pressure drop graphs to help select the proper fan that will deliver the desired
airow. Enter the graph from the bottom at the specied CFM and move vertically upward to the fan
curve for the desired size, then horizontally to the left and read the estimated static pressure drop
resulting from these typical accessory packages. Add the accessory pressure loss to the system (or
building) design static pressure loss to obtain the total static pressure loss to be used for the proper
fan selection.
PRESSURE LOSS GUIDE FOR 1” FILTER BOX
PRESSURE LOSS GUIDE FOR 2” FILTER BOX
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Pressure Loss (In. W.G.
)
CFM
SQD 6 SQD 8
SQD 10 SQD 12 SQD 15
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Pressure Loss (In. W.G.
)
CFM
SQD 6 SQD 8
SQD 10 SQD 12 SQD 15
FILTER BOX OPTIONS Cont.