Negative Pressure Units

The latest range of "Neg Air" units developed for applications, where the removal of hazardous dust and fumes needs to be controlled.

The products have been designed for use in the Asbestos Removal Industry but other typical applications are in the Nuclear and Pharmaceutical Industries where Asbestos, Silica, Dioxins, PCB's and other carcinogens are present.
Designed for use by the most demanding contractor and built from the latest Polypropylene Plastic the units do not rust, are strong and lightweight, typically half the weight of older metal units.They are easily cleaned and can be split apart for ease of carrying upstairs or transporting to and from site.
NPU 4002 Split

The units are easy to use and quiet in operation, simply connect the power supply, switch on the motors and adjust the variable speed controller to meet the air filtration requirements.

Utilising the latest filter technology and using readily available industry standard size filters, we have eliminated the need for expensive, non-standard replacements. Available with a choice of 2 or 3 stage filtration using HEPA (High Efficiency Particle Absolute) filter, with 99.997% efficiency. Other filters or combinations are available to specification.

All the filters have been matched with the motors to ensure the optimum airflow and filtration, therefore not exceeding the filter's efficiency.
NPU 4000 Compact

NPU 1500 Compact

All the filters have been matched with the motors to ensure the optimum airflow and filtration, therefore not exceeding the filter's capacity.
Units are available in light gray leatherette finish which is attractive and less liable to scratching. The two parts of many SMH NPU's can be separated for use restricted spaces and connected together using flexible ducting and can be positioned inside the contaminated area.
NPU 500 with Spigot and NPU 850
SPECIFICATION CHART
SMH-NPU
SPECIFICATION CHART

NPU 400

NPU 500
NPU 850
NPU 1500
NPU 2000
NPU 4000
NPU 8000
LENGTH mm
390
400
450
920
1020
1200
1510
WIDTH mm
380
380
380
460
530
700
700
HEIGHT mm
400
400
400
460
530
700
1000
PARTS
1
1
1
2
2
2
2
WEIGHT (kg)
15
18
20
50
50
80
120
MOTORS
1
1
1
1
1
2
1
MOTOR POWER (Watts)
150
160
455
1000
1000
2x1000
3000
VOLTAGE
220
220/110
220/110
220/110
220/110
220/110
220
CURRENT (Amps)
1
0.5
2.5/5
000
 000
14'28
15
AIRFLOW with filters/cubic m/hr
390
524
650
1248
1844
3552
6000
PRE-FILTERS (F1) mm
296x296x47
296x296x47
296x296x47
372x372x98
596x596x98
596x596x98
896x596x98
INTERMEDIATE FILTER (F2) mm
N/A
N/A
N/A
N/A
N/A
N/A
N/A
HEPA FILTER (F3) mm
296x296x47
305X305X150
305X305X150
381x381x98
457x457x292
610x610x292
915x610x292
ROVING FILTER (E)
N/A
YES
YES
YES
YES
YES
YES
SPIGOT PLATE (D)
YES
YES
YES
YES
YES
YES
YES
DUCTING Extract FD1 mm
150
150
200
300
300
400

450
DUCTING Joining FD2 mm
N/A
N/A
N/A
N/A
300
400
450
DUCTING Spigot Intake FD3
N/A
200mm
YES
YES
300mm
400mm
450mm
VARIABLE SPEED
NO
NO
YES
YES
YES
YES
NO
PASCAL GUAGE
YES
YES
YES
YES
YES
YES
YES
HOUR METER
NO
YES
YES
YES
YES
YES
YES
ON/OFF SWITCH
NO
YES
YES
YES
YES
2
YES
RCD (220 Models Only)
NO
YES
YES
YES
YES
YES
YES

Negative Air Units have carrying handles and are mounted on heavy duty rubber to enable easy movement. All units can pass through a standard doorway. Most units have an On/Off switch, Variable Speed Control, Hour Meter and a colour coded Pressure Gauge showing the filter condition, indicating when the filters need changing. To ensure better electrical safety Residual Current Devices are fitted as standard to 220 volt models and most 110 volt models.