SMAY NAF User manual
Operation and Maintenance Manual –NAF diffuser with particulate filter
2
1. INTRODUCTION
The purpose of this Operation and Maintenance Manual is to familiarize the
user with the intended use, design, operating principle, installation and
operation of the product.
2. INTENDED USE
NAF diffusers are designed for low and medium pressure ventilation systems.
They are used in facilities with increased air quality requirements e.g. hospitals,
laboratories (in order to keep the purity of tested samples and limit the
escape of harmful pollutants), food industry and pharmaceutical premises,
and microelectronics assembly premises. By using an H13 class particulate
filter, they provide a very high degree of supply air purity.
3. TECHNICAL DESCRIPTION
Execution –plenum box
NAF are equipped with a plenum box with a side or top circular connector
with a damper. The damper is fitted with an adjusting lever inside the box,
with adjustment next to the connector, outside the box. The standard plenum
box is made of galvanized steel coated with RAL 9010. On request it is
possible to make it of stainless steel. In standard execution, there are spigots
for connecting a differential pressure gauge, installed in the plenum box
casing.
In standard execution, the box is equipped with a nipple fittings for filter
integrity testing (tracer-gas leak testing method), and optionally with a nipple
fittings for filter gasket tightness testing. The construction of the box allows the
use of test methods in accordance with ISO 14644: Cleanrooms and
associated controlled environments –Part 3: Test methods.
Execution –air filter
The filter is classified as H13 according to EN 1822: 2009, in a casing made of
galvanized steel with an 8 mm flat gasket, made of high quality neoprene.
Verification of the filter pollution level is possible using a differential pressure
switch connected to the nipple fittings mounted in the box casing. It is
recommended to use the differential pressure gauge for the optimum
operation of the diffuser.
Execution –diffuser
Plenum boxes are equipped with diffusers for ceiling mounting: SDA4, NS-4,
NS-5, NS-8, NS-9 or with grilles for wall mounting: type series ST and AL.
Standard diffusers are made of powder-coated steel in RAL 9010 white.
On request it can also be coated with another RAL colour.
Operation and Maintenance Manual –NAF diffuser with particulate filter
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Guidelines for designing
For proper operation of the diffuser, the recommended airflow velocity
through the H13 class 150 mm filter should not excess 0.75 m/s, and for the
292 mm filter –1.5 m/s.
The final airflow resistivity should not exceed 500 Pa. The maximum operation
temperature 70 °C.
It is recommended to replace the air filters when the pressure drop measured
at the filter in use exceeds twice the value of the pressure drop declared for
a new filter.
4. INSTALLATION CONDITIONS
There are four Ø8 holes in the NAF box for installation by means of slings. If the
filter is square-shaped (dimensions A=B, Fig. 1), the diffuser is mounted to the
plenum box by means of the central screw, and for rectangular-shaped filter
(dimensions A≠B, Fig. 2) with screws through the holes in the diffuser frame.
Fig. 1. Example of the NAF box mounted in the ceiling.
NAF box
suspension –
not supplied
Ceiling
Gasket between the box and
the ceiling –not supplied
Gasket –supplied
with diffuser
M6 screw
L=G+70
DIN7991
Suspended
ceiling
Plug
Supply
diffuser
(A+30)x(B+30)
Ceiling opening
Operation and Maintenance Manual –NAF diffuser with particulate filter
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Fig. 2. Example of the NAF box mounted in the wall.
Filter installation
The filter should be delivered to the installation site in its original cardboard
box. The filter can be grabbed by the frame only; it is forbidden to touch the
filtering package even if the filter is equipped with a protective mesh.
The installation of the filter in the box is done by carefully grasping the filter
frame and inserting it into the plenum box until the safety spring is engaged
which locks the filter against falling out of the box. Once the spring has been
engaged, two opposite corners should be mounted and tightened with
a 4 mm hexagonal wrench; the other two corners should have been
mounted beforehand with the assembly console as shown in Fig. 3
(the console must be located between the self-aligning foot and the corner,
with the channel wings of the console facing the set foot). The four set screws
should be tightened evenly to ensure a tight connection between the filter
and the box; usually 3 full revolutions of each of the four screws are enough
once the gasket has touched the retaining frame.
In case of rectangular plenum boxes for the A≠B filters, the filter is secured by
means of four corners with the set feet without a console.
Gasket between the box and
the wall –not supplied
(A+45) x (B+45) –wall
opening dimension
Gasket supplied with
the ventilation grille
M4 screw DIN 7991
L=G+15, 8 pcs.
ALW ventilation grille
Wall, thickness G
NAF box suspension –not supplied
Operation and Maintenance Manual –NAF diffuser with particulate filter
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Fig. 3. Console installation inside the NAF box.
5. TRANSPORT AND STORAGE CONDITIONS
The NAF diffusers are supplied on pallets, wrapped in plastic.
The product should be stored in closed rooms providing protection against
weather conditions.
Always secure the product against moving during transport. It is not allowed
to stack the products.
The products should be protected against weather conditions during
transport. After every delivery it is necessary to carry out a visual inspection of
the elements. Do not expose to mechanical damage.
6. WARRANTY TERMS
oThe Manufacturer warrants the products supplied according to the
provisions of the Agreement or the General Warranty Terms and
Conditions of Smay Sp. z o.o.
oThe Warranty does not cover defects caused by improper storage,
transport, installation of the elements and especially mechanical
damage and defects of the anti-corrosion coatings.
oThe Warranty is void when it is found that the User made structural
modifications on their own or installed the product not in accordance
with the Operation and Maintenance Manual.
Corner
Console
Ball jointed
levelling
feet
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