“Australian Manufacturing, Not warehousing”
Vertical Discharge Roof Mounted Fans 400mm to 950mm
other standard sizes 1150mm, 1250mm & 1530mm
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Noise
indicator
Model
 
SDV
SDVY
SDV2Y
 
SGVY
SGV4Y
 
SHVY
SHV4Y
 
SJVY
SJV4Y
 
SKVY
SKV4Y
 
SMV8Y
SMVY
SMV4Y
 
SRV8Y
SRVY
SRVYL
 
SR6V8Y
SR6V
SR6VYL
Size
 
400
400
400
 
500
500
 
550
550
 
600
600
 
650
650
 
750
750
750
 
900
900
900
 
950
950
950
Sq. Base
 
435 x 435
435 x 435
435 x 435
 
535 x 535
535 x 535
 
600 x 600
600 x 600
 
650 x 650
650 x 650
 
710 x 710
710 x 710
 
810 x 810
810 x 810
810 x 810
 
950 x 950
950 x 950
950 x 950
 
1010 x 1010
1010 x 1010
1010 x 1010
Height
 
710
710
710
 
710
710
 
710
710
 
750
750
 
750
750
 
810
810
810
 
910
910
910
 
910
910
910
240/415volt
 
√ / ø
√ / O
√ / O
 
√ / O
O / √
 
√ / O
O / √
 
√ / O
• / √
 
ø / √
• / √
 
ø / √
ø / √
• / √
 
ø / √
ø / √
ø / √
 
ø / √
ø / √
ø / √
Type
see graph
A
A-B
INDUSTRIAL
 
A-B
C
 
B
C
 
B
C-D
 
C-D
INDUSTRIAL
 
C-D
D
INDUSTRIAL
 
D
D-E
E-F
 
E-F
F
INDUSTRIAL
STANDARD MODEL
in Stainless Steel opt.
EXTENDED VERTICAL DISCHARGE OUTLET
√ Standard, O Option, Ø Not Available
How To Select The Correct Performance
for Exhaust Hood / Kitchen Canopy and Duct Design
Using SMITHS Exhaust Rate Selection Graph
Shown at the bottom of this page.
 
The graph below is designed to help our Customers estimate the exhaust rate for any
ventilation system incorporating hoods or canopies, however, there are some very
important guidelines to follow when making any fan selection.
 
1). DO NOT OVERESTIMATE the exhaust rate required.
This will INCREASE - Cost, Noise, Power used and Make-up air.
Example 1., Hood AREA of 3.45M, (shown at left of Exhaust Rate Selection Graph)
the MAXIMUM Exhaust Rate is 2,100L/sec and in most Commercial applications this
should not be exceeded without checking with our Engineering staff.
DO NOT INCREASE the Exhaust Rate to compensate for ELBOWS or long lengths of duct.
 
2). DO NOT UNDERESTIMATE the duct size required.
This will INCREASE - Cost, Noise, Power used and Pressure drop.
Example 1. shown at the left of our selection graph, results in 2,100L/sec.
The minimum duct size at 2,100L/sec is 460mm x 460mm (<10.0m/sec).
350mm x 350mm duct will increase the Pressure (VPa) by 300%
 
3). DO NOT OVERESTIMATE the Pressure drop.
Many fan selections are based on a guess of the Pressure drop in the system.
The most common mistake is to add the Resistance Pressure of filters.
A standard Panel filter is only 85-100Pa when dirty, adding the filters together
results in Pressure drop guesses 300-400Pa that should only be 85-100Pa.
If the duct is straight (no elbows) and large enough (see item 2 above) the maximum
Fan Pressure drop will only be 100-110Pa.
Example of Low Pressures in STRAIGHT DUCT with Velocities <10.0m/sec:
460mm x 460mm x 2.4M long duct at 2,100L/sec = Pressure drop of only 5Pa (10.0m/sec)
 
Example of Low Pressures in ELBOWS with Curve Ratios of 0.25 (see [C] at right).
Velocities <10.0m/sec also result in low pressures in ELBOWS.
Curve Ratio (CR) = Inside Radius ÷ Outside Radius:
Using a 460mm x 460mm elbow with inside radius of 155mm the CR ≈ 0.25
The Pressure drop at 2,100L/sec (<10.0m/sec) ≈ 20Pa
 
 
If followed correctly, these guidelines will result in fan selections that
consume very little power (less than 400watts in Example 1 and less
than 800watts in Example 2)
and avoid the spiralling costs of electricity,
increasing customer profits and reducing the effect on our environment.
DUCT DESIGN BASICS
 
[A]Large Duct Area.
= low velocities
= low pressure
= low power
= low Fan costs
= low running cost
 
[B]Smooth 25-30° Paths.
avoid steep angles in
adaptors/transitions and
duct offsets.
 
[C]Curved Elbows.
Elbows/bends cause the
greatest resistance to
smooth airflow and must be
designed to avoid the
costs of using high pres-
sure fans that consume
kilowatts of power.
Fan with 25° Transition
Adaptor
Contact our Ventilation Engineers 1300 787 456, (08) 9337 4211, Mobile 0438 37 4211, EMAIL sales@smithsfans.com.au
“Australian Manufacturing, not warehousing”
©COPYRIGHT OWNER WH Smith & Co Pty Ltd SMITHS INDUSTRIAL FANS
This document and all information contained herein is subject to COPYRIGHT.
Redistribution, in any form, is prohibited without written authority from WH Smith & Co Pty Ltd
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE