MPQ24S48-50C - Wall Industries

TECHNICAL DATASHEET
Rev. D
MPQ24S48-50C
50 W DC-DC Converter
10-36 Vdc Input
48 Vdc Output at 1 A
Quarter-Brick Package
Features:
 Over 87% Efficient at Full Load
 Fast Transient Response
 Operation to No Load
 Output Trim ±10%
 Remote ON/OFF
 Remote Sense Compensation
 Low Output Ripple







Fixed Switching Frequency
Output Over Current Protection
Output Short Circuit Protection
Over Temperature Protection
1000 V Isolation
100% Burn In
Heatsink Available
Description:
The MPQ24 series is a high density, low voltage input quarter brick converter that
incorporates the desired features required in today’s demanding applications while
maintaining low cost. When performance, reliability, and low cost are needed, the MPQ
series delivers.
(888) 597-WALL
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1 of 11
WALL INDUSTRIES, INC.
Rev. D
TECHNICAL DATASHEET
MPQ24S48-50C
Model No. MPQ24S48-50C
Technical Specifications
All specifications are based on 25°C, Nominal Input Voltage and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
Related condition
Switching Frequency
INPUT (Vin)
Operating Voltage Range
UVLO Turn On at
UVLO Turn Off at
UVLO Hysterisis
Maximum Input Current (Graph 3)
No Load Input Current (Graph 5)
Input Current under “Remote Off” (Graph 6)
Reflected Ripple Current (Photos 1 & 2)
Input Surge Voltage
EFFICIENCY (Graph 1)
Low Line
No Load
Active High Unit
Measured with a 120 µF Alum. Elect. Input Capacitor
100 mS
Min
Nom
Max
Unit
-
200
-
kHz
10
9.8
9.4
-
24
10.0
9.7
0.3
5.5
0.063
3.1
164
87
36
10.3
9.9
50
-
Vdc
Vdc
Vdc
Vdc
A
A
mA
mA
Vdc
%
Vdc
%
OUTPUT (Vo)
Voltage Set Point
±Sense shorted to ±Vout
Voltage Adjustment (Table 2)
Max Output limited to 90W
Load Regulation (Graph 7)
Line Regulation (Graph 8)
Temperature Drift (Graph 9)
±Sense shorted to ±Vout
±Sense shorted to ±Vout
Remote Sense Compensation
Ripple (Photos 7 & 8)
Spikes (Photos 7 & 8)
Current
Current Limit
Max Output limited to 50W
(as measured at the converter output pins)
20 MHz BW
20 MHz BW
Power Limited-Dependent upon SENSE compensation
and TRIM adjustment
Over Voltage Limit
DYNAMIC RESPONSE
Load step /  V (Photos 9 to 12)
Recovery Time (Photos 9 to 12)
Turn On Delay (Photo 3)
Turn On Overshoot (Photos 3 & 5)
Hold Up Time (Photo 4)
REMOTE ON/OFF
Remote ON – Active High
Remote OFF – Active High
Remote ON/OFF pin Floating – Active High
ION/OFF Sink to pull low – Active High
Remote ON – Active Low
Remote OFF – Active Low
Remote ON/OFF pin Floating – Active Low
ION/OFF Sink to pull low – Active Low
ION/OFF Source to drive high – Active High or Low
Turn On Delay – (Photo 5)
Turn Off Delay – (Photo 6)
ISOLATION
Input-Output
Input/Output-Chassis
Isolation Resistance
Isolation Capacitance
THERMAL
Ambient (Graph 2)
Over Temperature Protection
Storage Temperature
MTBF
MECHANICAL
Weight
(888) 597-WALL
47.2621.55
43.20
-10%
-
-
0
104
-
48.744
+1.55
52.80
+10%
0.1
0.1
0.025
52.80
10%
250
250
1.0
1.3
1.6
1.9
A
52.8
54.0
58
Vdc
48.000
48.0
0.01
0.01
0.013
25% to 100% Io, di/dt=0.025A/uS
325
Recovery to within 1% Nominal Vout
1
From Vin (min) to Vout (mom)
15
Full Load Resistive
0.0
From Vin (min) to VULVO_Turn_Off
0
Active High or Active Low (For Active Low add an ‘R’ to the end of the Part Number)
Min High to Enable
1.5
Max Low to Disable
0.3
Over Operating Voltage Range
1.6
5.2
VON/OFF =0V, Vin=36 V
0.15
Max Low to Enable
0.8
Min High to Disable
2.1
Over Operating Voltage Range
2.3
6.2
VON/OFF =0V, Vin=36V
0.6
0
Enable (max Low) to Vout (min)
3
Enable (0V) to Vout (min)
100
1 minute
1 minute
at 25°C
Max. Ambient limited by Derating Curves (Graph 2)
Case Temperature
1000
1000
20
-40
-55
Calculated Using Bellcore TR-332 Method 1 case 3
-
www.wallindustries.com
0.01
-
Graph 2
25
110
125
1,250,300
See Figure 1
61
-
Vdc
%
%
% / °C
Vdc
%
mVpk-pk
mVpk-pk
A
mV
ms
ms
%
mS
Vdc
Vdc
Vdc
mA
Vdc
Vdc
mA
mA
ms
µS
Vdc
Vdc
GΩ
µF
°C
°C
°C
hours
g
Page 2 of 11
WALL INDUSTRIES, INC.
TECHNICAL DATASHEET
Rev. D
MPQ24S48-50C
Table 1: Pin Assignments
Pin #
Pin Name
1
2
3
4
5
6
7
8
Function
+Vin
Enable
-Vin
+Vout
+SENSE
TRIM
-SENSE
-Vout
Comments
Positive Input
Remote On/Off
Negative Input
Negative Output
Negative Remote Sense
Output Voltage Trim
Positive Remote Sense
Positive Output
If not used, leave open for standard unit, short to –Vin on ‘R’ units.
If not used, short to –Vo.
If not used, leave open.
If not used, short to +Vo.
Figure 1: Mechanical Dimensions
Unit: inches [mm]
ANGLES ±1
.XX=±.02[0.5] .XXX=±.010[0.25]
.00 [0.0]
.60 [15.2]
.51 [13.0]
2.37 [60.2]
.30 [7.6]
DOT DENOTES
PIN-1
.45 [11.4]
.30 [7.6]
.60 [15.2]
THIRD ANGLE PROJECTION
.15 [3.8]
.00 [0.0]
DO NOT SCALE DRAWING
INTERPRET DIMENSION AND TOLERANCE
PER ASME Y14.5M - 1994
.00 [0.0]
THIRD ANGLE PROJECTION
.00 [0.0]
.112(NO:4)-40UNC-2B 4X
MAX SCREW DEPTH .100 FROM SURFACE-A 4X
MAX APPLIED RECIEVING
TORQUE: 6.0 lbf in [ 0.68 N m]
UNLESS OTHERWISE SPECIFIED
DO
NOT
SCALEARE
DRAWING
ALL DIMENSONS
IN INCHES
XX ] ARE IN MILLIMETERS
INTERPRET [DIMENSION
AND TOLERANCE
TOLERANCES:
PERAPPLIED
ASME Y14.5M
- 1994
ANGLES= ±1°
.XX=±.02[0.5] .XXX=±.010[0.25]
1
.47 [11.9]
+Vout
Ø.062 [1.57]
5
+SENSE
Ø.040 [1.02]
6
TRIM
Ø.040 [1.02]
7
-SENSE
Ø.040 [1.02]
8
-Vout
Ø.062 [1.57]
3
3
.47 [11.9]
4
5
6
7
8
LABEL
1.860 [47.24]
NOTES:
-A-
SEE NOTE-4
.19 [4.7]
.005
INTERFACE-PLANE
4
4
5
6
7
8
.26 [6.5]
Ø.062 [1.57]
.60 [15.1]
Ø.040 [1.02]
-Vin
1
2
.41 [10.4]
ON/OFF
3
1.030 [26.16]
INTERFACE-PLANE
2
2
XXXX
Ø.062 [1.57]
XXXX
+Vin
MODEL NAME
1
WALL INDUSTRIES
PIN DESIGNATION PIN Ø
1.54 [39.1]
.26 [6.5]
.19 [4.7]
1. PIN TO PIN TOLERANCE: ±.010 [±0.25] MEASURED AT STANDOFF FEATURE ONLY, DATUM-B.
2. PIN DIAMETER TOLERANCE OF : ±.005 [±0.13] MEASUREMENT READING APPLIES
TO AREA FROM INTERFACE-PLANE SURFACE DATUM-C TO END OF PIN ONLY.
3. UNLESS OTHERWISE SPECIFIED.
4. THERMAL TRANSFER PLATE MATERIAL: .040 [1.02] THICK, ALUMINUM ALLOY 3003-0,
PER: QQA 250/2 WITH BLACK SOFT SULFURIC ANODIZE FINISH.
.00 [0.0]
INTERFACE-PLANE
C
PIN END
.071±.005 [1.80±0.13]
STANDOFF DIMENSION
Ø.040 [1.02] PINS ONLY 4X
RECOMMENDED FINISHED RECEIVING PCB
STAND-OFF HOLE Ø.052±.003 [1.32±0.08]
PIN-2 SHOWN FOR DIMENSIONS
B
.20 MIN [5.1 MIN]
SEE NOTE-3
PIN LENGTH FROM
INTERFACE-PLANE ONLY
2.00 [50.8]
Mechanical Dimensions (Heatsink Option – “HS” suffix)
Unit: inches [mm]
.60 [15.2]
.00 [0.0]
.30 [7.6]
.15 [3.8]
.51 [13.0]
2.37 [60.2]
.45 [11.4]
.00 [0.0]
DOT DENOTES
PIN-1
.00 [0.0]
.00 [0.0]
.30 [7.6]
.60 [15.2]
.112(NO:4)-40UNC-2B 4X
MAX SCREW DEPTH .100 FROM SURFACE-A 4X
MAX APPLIED RECIEVING
TORQUE: 6.0 lbf in [ 0.68 N m]
3
.85 +.04 21.5 +1.0
-0.5
-.02
.60 [15.1]
.47 [11.9]
4
5
6
7
8
1.860 [47.24]
LABEL
.41 [10.4]
INTERFACE-PLANE
4
5
6
7
8
2
-A-
INTERFACE-PLANE
XXXX
3
1
.26 [6.5]
XXXX
XXXXXXXXXXXHS
WALL INDUSTRIES
2
1.030 [26.16]
1
1.54 [39.1]
.26 [6.5]
.47 [11.9]
SEE NOTE-4
PIN DESIGNATION PIN Ø
.19 [4.7]
INTERFACE-PLANE
C
.071±.005 [1.80±0.13]
STANDOFF DIMENSION
Ø.040 [1.02] PINS ONLY 6X
RECOMMENDED FINISHED RECEIVING PCB
STAND-OFF HOLE Ø.052±.003 [1.32±0.08]
B
.20 MIN [5.1 MIN]
SEE NOTE-3
PIN LENGTH FROM
INTERFACE-PLANE ONLY
2.00 [50.8]
.19 [4.7]
(888) 597-WALL
3
1. PIN TO PIN TOLERANCE: ±.010 [±0.25] MEASURED AT STANDOFF FEATURE ONLY, DATUM-B.
2. PIN DIAMETER TOLERANCE OF : ±.005 [±0.13] MEASUREMENT READING APPLIES
TO AREA FROM INTERFACE-PLANE SURFACE DATUM-C TO END OF PIN ONLY.
3. STANDARD PIN LENGTH UNLESS OTHERWISE SPECIFIED.
4. THERMAL TRANSFER PLATE MATERIAL: .040 [1.02] THICK, ALUMINUM ALLOY 3003-0,
PER: QQA 250/2 WITH BLACK SOFT SULFURIC ANODIZE FINISH.
.00 [0.0]
PIN END
2
NOTES:
.005
A
1
4
5
6
7
8
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1
+Vin
Ø.040 [1.02]
2
ON/OFF
Ø.040 [1.02]
3
-Vin
Ø.040 [1.02]
4
+Vout
Ø.062 [1.57]
5
+SENSE
Ø.040 [1.02]
6
Ø.040 [1.02]
7
TRIM
-SENSE
8
-Vout
Ø.062 [1.57]
Ø.040 [1.02]
Page 3 of 11
WALL INDUSTRIES, INC.
Rev. D
TECHNICAL DATASHEET
MPQ24S48-50C
DESIGN CONSIDERATIONS
Under Voltage Lock Out (UVLO)
The converter output is disabled until the input voltage exceeds the UVLO turn-on limit. The converter will remain ON until the input
voltage falls below the UVLO turn-off limit.
Over Current Protection
The converter is protected from short circuit and over current conditions. Upon sensing an over current, the output will begin to drop (or
‘foldback’) limiting the output power. Further increasing the output current will cause the converter to shut off and then restart (or
‘hiccup’) until the overcurrent condition is removed. Shorting the output will cause the converter to immediately enter the ‘hiccup’ mode.
Over Temperature Protection
The converter is protected from over temperature conditions. Upon exceeding this temperature, the converter will shut down. The
converter will automatically recover once the over tempature condition is removed.
Input Filter
No additional input capacitor is needed for the power supply to operate. However, due to the low voltage, high input current nature of the
power supply, it is highly recommended that a minimum 100 uF/50 V electrolytic type input bulk capacitor be added to reduce input
ripple voltage and current. Refer to Photos 1 and 2 for an example. For an even further reduction of input ripple, an inductor may be
placed between the source and the previously mentioned capacitor. Additionally, a 1-10 uF ceramic capacitor may be added in front of
the inductor to form pi-filter. No inductor should be placed between the capacitor and the input to the converter.
Output Filter
No additional output capacitor is needed for the power supply to operate. However, to reduce the ripple and noise on the output,
additional capacitance may be added. Usually, a ceramic capacitor between 0.1 and 1 uF is recommended for reducing any ringing and
spike noise. Also, capacitance in the form of an aluminum electrolytic capacitor may also be placed across the output in order reduce
ripple, and improve the transient peak-to-peak voltage deviation (see Photos 7 to 11), but in most cases, is not necessary.
Remote Sense
To improve regulation at the load, route the connections from the -Sense and the +Sense pins to the –Vout and +Vout connections at the
load. This will force the converter to regulate the voltage at the load and not at the pins of the converter. If it is not desired to use the
Remotes Sense feature, the –Sense and +Sense pins should be shorted to the -Vout and +Vout pins respectively. However, no damage to
the converter will occur if the Sense pins are left open.
Fusing
It is required that the input to the converter be supplied with a maximum 10 A, 250 V rated fuse UL Listed or R/C fuse.
Safety
The MPQ24 series is designed to meet EN60950 Safety of Information Technology Equipment. The isolation provided by the MPQ24
series is a Basic insulation in accordance with EN60950. SELV output reliability is maintained only if the input to the converter is a
SELV source. To maintain SELV reliability, if either +Vin or –Vin is connected to chassis, either +Vout or –Vout must also be
connected to chassis. Otherwise, both the input and the output must not be connected to chassis.
PCB Layout Considerations
Due to the Basic isolation provided by the converter, caution must be observed in routing traces more than 2 mm inward of any input or
output pins on the top layer of the pcb board underneath the converter. Also, due to noise coupling and isolation requirements, no power
or ground planes or any signal traces should be routed on the top layer of the pcb underneath the converter. Due to comon noise coupling,
input or output power and ground planes should not be poured across the input to output on any layers underneath the converter. Instead,
it is best to provide separate input and output power and ground traces on the bottom or an inner layer with a miminum of 1 mm
separation between traces on the same layer.
Lastly, as the case/heatsink is floating metal, caution must also be observed to provide appropriate spacing (minimum 1.4 mm for
Pollution degree 2 Material Group IIIa + IIIb) around the case/heatsink or risk reducing the input to output spacing and violating Basic
insulation requirements.
(888) 597-WALL
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Page 4 of 11
WALL INDUSTRIES, INC.
Rev. D
TECHNICAL DATASHEET
MPQ24S48-50C
Remote ON/OFF
This converter has the ability to be remotely turned ON or OFF. The series may be ordered Active-High or Active-Low (place an option
‘R’ at the end of the part number). Active-High means that a logic high at the ENABLE pin will turn ON the supply (Figure 2). With
Active-High, if the ENABLE pin is left floating, the supply will be enabled. Active-Low means that a logic low at the ENABLE pin will
turn ON the supply (Figure 3). With Active-Low, if the ENABLE pin is left floating, the supply will be disabled. If remote On/Off is not
used on an Active-Low supply, short the Enable pin to –Vin.
Output Voltage Trim
The output is adjustable from +/–10% of the output voltage. To adjust the output voltage low, place a resistor between the TRIM and SENSE pins (Figure 4). To adjust the output voltage high, place a resistor between the +SENSE and TRIM pins (Figure 5). The value of
the TRIM resistor with respect to the desired output voltage can be found in Table 2 or derived from the following equations:
RTrim  Low 
Vonom   %  100 100

 5.11 (in k)
2.5  %
%
Vo  /   Vonom
where Δ%  Percent Trim 
100
Vo  / 
100
 5.11 (in k)
%
RTrim  High 
Table 2: Trim Resistor Values (in kΩ)
Percent
Trim
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
TRIM Low
Vout
RLow
47.520
93.89
47.040
43.89
46.560
27.22
46.080
18.89
45.600
13.89
45.120
10.56
44.640
8.18
44.160
6.39
43.680
5.00
43.200
3.89
(888) 597-WALL
TRIM High
Vout
RHigh
48.480
1833.09
48.960
923.09
49.440
619.76
49.920
468.09
50.400
377.09
50.880
316.42
51.360
273.09
51.840
240.59
52.320
215.31
52.800
195.09
Note 2: While decreasing the output voltage, the maximum output current
remains the same, and while increasing the output voltage, the output
current is reduced to maintain the total output power at 50 W.
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Page 5 of 11
WALL INDUSTRIES, INC.
TECHNICAL DATASHEET
Rev. D
MPQ24S48-50C
Graph 1: MPQ24S48-50C Efficiency vs. Output Current
90%
88%
86%
Effiency (%)
84%
82%
Vin=12V
Vin=20V
Vin=28V
Vin=36V
80%
78%
76%
74%
72%
70%
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Io (A)
Graph 2: MPQ24S48-50C Max Ambient vs. Io
1.2
1.0
Io (A)
0.8
Vin=12-28V (200LFM)
Vin=12-28V (100LFM) & 29-36V (200LFM)
Vin=10-16V (No Air) & 29-36V (100LFM)
Vin=17-23V (No Air)
Vin=24-30V (No Air)
Vin=30-36V (No Air)
0.6
0.4
0.2
0.0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Ambient (°C)
Note 3: When trimming output high, Io vs. Ambient is derated by power. ie: from Graph 2, find the maximum current at the desired
ambient and airflow, and multiply this current by the nominal voltage to get the maximum power. Divide this power by the desired
trimmed high voltage to get the maximum current at that ambient. When trimming low, the maximum current stays the same as shown in
Graph 2.
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Page 6 of 11
WALL INDUSTRIES, INC.
TECHNICAL DATASHEET
Rev. D
Graph 3: MPQ24S48-50C Input Current vs. Input Voltage
MPQ24S48-50C
Graph 4: MPQ24S48-50C Power Dissipation vs. Input Voltage
10
5.0
Io=0A
Io=0.2A
Io=0.4A
Io=0.6A
Io=0.8A
Io=1.0A
8
Pdissipation (W)
4.0
Io=0A
Io=0.2A
Io=0.4A
Io=0.6A
Io=0.8A
Io=1.0A
Iin (A)
3.0
2.0
6
4
2
1.0
0
0.0
12
16
20
24
Vin(V)
28
32
12
36
16
24
28
32
36
Vin(V)
Graph 5: MPQ24S48-50C No Load Input Current and Power
Dissipation vs. Input Voltage
0.150
Graph 6: MPQ24S48-50C "Remote Off" Input Current and
Power Dissipation vs. Input Voltage
6.0
3.0
300
Input Current - R Unit
Input Current
Power Dissipation - R Unit
Power Dissipation
Input Current
2.0
4.0
200
0.075
1.5
3.0
150
0.050
1.0
2.0
100
0.025
0.5
1.0
50
0.0
0.0
12
16
20
24
28
32
36
Iin (mA)
0.100
0.000
250
Pdissipation (mW)
5.0
Power Dissipation
Pdissipation (W)
2.5
0.125
Iin (A)
20
0
12
16
20
24
28
32
36
Vin(V)
Vin(V)
Note 4: Voltage measurements taken where the output pins are
soldered into test board.
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Page 7 of 11
WALL INDUSTRIES, INC.
Rev. D
Graph 7: MPQ24S48-50C Load Regulation
(+SENSE to +Vout, -SENSE to -Vout)
0.05%
0.04%
0.04%
Vin=12V
Vin=20V
Vin=28V
Vin=36V
Io=0A
Io=0.2A
Io=0.4A
Io=0.6A
Io=0.8A
Io=1.0A
0.03%
0.02%
Regulation (%)
Regulation (%)
0.02%
MPQ24S48-50C
Graph 8: MPQ24S48-50C Line Regulation
(+SENSE to +Vout, -SENSE to -Vout)
0.05%
0.03%
TECHNICAL DATASHEET
0.01%
0.00%
-0.01%
0.01%
0.00%
-0.01%
-0.02%
-0.02%
-0.03%
-0.03%
-0.04%
-0.04%
-0.05%
-0.05%
0.0
0.2
0.4
0.6
0.8
1.0
Io (A)
12
16
20
24
28
32
Vin (V)
Graph 9: MPQ24S48-50C Output Temperature Drift
(+SENSE to +Vout, -SENSE to -Vout)
1.0%
0.8%
0.5%
Vout (%)
0.3%
0.0%
-0.3%
-0.5%
-0.8%
-1.0%
-40
-20
0
20
40
60
80
100
Case Temperature (°C)
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Page 8 of 11
36
WALL INDUSTRIES, INC.
Rev. D
TECHNICAL DATASHEET
MPQ24S48-50C
Photo 1: Input Ripple Voltage and Current
Vin=24 V, Iout = 1 A
Photo 2: Input Ripple Voltage and Current
Vin=24 V, Iout = 1 A
With a 120 µF Aluminum Electrolytic across the Input
Photo 3: Normal Turn On at 24 V
Cout = 68 µF
Photo 4: Normal Turn Off at 24 V
Cout = 68 µF
Photo 5: Turn On by Enable at 24 V
Cout = 68 µF
Photo 6: Turn Off by Enable at 24 V
Cout = 68 µF
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Page 9 of 11
WALL INDUSTRIES, INC.
Rev. D
TECHNICAL DATASHEET
MPQ24S48-50C
Photo 7: Output Ripple and Noise (20 MHz BW)
Vin=24 V, Iout = 1 A
Photo 8: Output Ripple and Noise (20 MHz BW)
Vin=24 V, Iout = 1 A
With a 68 µF Electrolytic across the Output
Photo 9: Transient Response – 0.025A/µs
Vin=24 V, Iout = 0.25 to 1 A (25% to 100%)
Photo 10: Transient Response – 0.25A/µs
Vin=24 V, Iout = 0.25 to 1 A (25% to 100%)
Photo 10: Transient Response – 0.025A/µs
Vin=24 V, Iout = 0.25 to 1 A (25% to 100%)
With a 68 µF Electrolytic across the Output
Photo 11: Transient Response – 0.25A/µs
Vin=24 V, Iout = 0.25 to 1 A (25% to 100%)
With a 68 µF Electrolytic across the Output
(888) 597-WALL
www.wallindustries.com
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WALL INDUSTRIES, INC.
TECHNICAL DATASHEET
Rev. D
MPQ24S48-50C
Ordering Information:
Part Number Example:
MPQ 24
S
48 – 50
C
R
Series
Designation
Nominal
Input
Voltage
Single
Output
Nominal
Output
Voltage
Maximum
Output
Power
Cased
housing
Options
R
HS
Leave Blank for no Options
Active Low Enable
Heatsink
Company Information:
Wall Industries, Inc. has created custom and modified units for over 40 years. Our in-house research and development engineers will
provide a solution that exceeds your performance requirements on-time and on budget. Our ISO9001-2000 certification is just one
example of our commitment to producing a high quality, well documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working closely with its
customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to provide ongoing support for
your project above and beyond the design and production phases. Give us a call today to discuss your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
(888) 597-WALL
(603)778-2300
 (888)587-9255
 (603)778-9797
[email protected]
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
www.wallindustries.com
Page 11 of 11