Jet Fan Systems - Systemair

Jet Fan Systems
www.systemair.com
Tailored solutions for
car park ventilation

Car park ventilation
– the principle
Basics
Jet fan systems are active systems
offering a cost effective solution to
ventilate and extract smoke from
enclosed or underground car parks.
This ductless ventilation system provides
either normal ventilation and can also
be provided for smoke extract in case
of emergencies, or a combination of
both, i.e. a dual purpose fan.
An efficient system requires good
planning, starting with the physical
dimensions of the cark park, considering
the pattern of utilisation as well as peak
loads. Ventilation rates are mostly based
on an air exchange rate (pollution), or
on a rate multiplied with the number
of parking spaces. This is defined in the
appropriate local building regulations,
defining normal ventilation and
emergency ventilation.
The typical system includes the jet fans
and main exhaust air fans, eventually
supply air fans, should the openings in the
building (entrance, ramps etc.) not be
sufficiently sized. In addition, a control
system with carbon monoxide detectors
and/or heat/smoke detectors is required
to operate the system effectively.
A jet fan system offers the “ventilation
on demand” principle also for car parks
– depending on the measurements of
the CO detectors. Jet fans can be
individually controlled, or grouped
together in fire zones. In fire mode, after
a pre-set standstill escape period, the
jet fans will run at full speed to quickly
and effectively clear the smoke.
Benefits
The space saving design, compared to
standard duct based ventilation systems,
offers a variety of benefits:
• It is possible to ventilate or extract
smoke in particular sections of the
car park. CO (carbon monoxide)
detectors and smoke sensors
ensure that only fans in polluted
areas are activated and the fans are
switching into smoke extract mode
immediately when a fire starts.
• No expensive, bulky and complex
duct systems, making it an ideal
solution also for renovations. Car
park design is more attractive.
• Improved air quality in underground
car parks compared to conventional
ducted systems (mixture of all layers
of air within the car park).
• Optimum safety is provided in case
of a fire in the car park. Rapid smoke
extraction, smoke cooling, limited
smoke spread, i.e. a better smoke
control.
• Jet fan systems for smoke extract
prevent costly consequential damages
in case of a fire: the ceilings are
subjected to less heat, and smoke is
quickly removed from the building.
• More flexible in positioning when
the parking area in the car park is redesigned.
• Energy saving in exhaust air fans due
to reduced system resistance (no
duct systems).
• Reduced installation and running
costs.
Control system
A control system is required, which is
tailored to handle the requirements of
the specific project for ventilating and
smoke extraction. As a rule of thumb,
car park ventilation is based on 6ACH
for normal ventilation and 10ACH for
smoke extract. Local regulations might
deviate.
A good control system saves energy by
reducing the ventilation rate with the
help of CO sensors, depending on the
car park usage, increasing ventilation
rate only in peak hours and operating
the jet fans only selectively, according
to demand.
When used for smoke extract, the
system has to work on a fire detection
system (heat or smoke detection).
In car parks with different levels, the
system has to run the jet fans full speed
on the fire level, and simultaneously
switch off the fans in all other levels.
The main exhaust air fans are switched
to full speed.
The control equipment regulates the
main supply and/or exhaust fans together
with the jet fans, both depending on the
signals coming from the sensors.

CFD simulation
A CFD simulation is needed to confirm
that there is enough air movement in
all areas of the car park to secure the
required number of air exchanges, to
confirm the proposed number of jet
fans and to determine the location
where the jet fans have to be installed.
In order to be able to perform a CFD
analysis, it is essential to have a -D
model of the building site, giving all
openings, slab height, surface of the
ceiling (flat or with drop beams,
dimensioning of the drop beams, etc.)
and all other details required to carry
out a simulation.
A CFD analysis is used to simulate the
airflows, to ensure that the distribution
of the air is sufficient to effectively
ventilate the cark park under normal
conditions as well as in emergency
situations.
Systemair offers this service meaning
everything from one source and firsthand
– truly tailored solutions.
Systemair range
Jet fans
The Systemair jet fans are equipped
with adjustable aluminium impellers
and IEC standard motors, available
for ambient temperatures for CO
exhaust (between 40°C and 60°C) or
for high temperature smoke exhaust
( 00°C/ h) applications.
Certification in accordance with
EN 1 101- . Two speed high
temperature fans can also be used for
normal CO extract ventilation (dual
purpose fans).
• Three sizes (315, 355 and 400 mm
impeller diameter), circular or
octagonal design.
• Also available with fully reversible
blade settings (on request).
• Fan casings and outside sheet for fan
housing and silencers manufactured
from pre-galvanized sheet.
• Fan module sound insulated for low
noise level.
Control system
With active motor protection in
ambient temperature mode, with
individual and grouped failure signal.
In case of fire motor protection is
being deactivated.
Each fan is controlled by an individual
control- and power unit. Possibility to
have auto-changeover to a standby fan,
should on of the main fans fail.
Tailored
solutions
• Pre-wired terminal box manufactured
from thermoplast in ambient
temperature version, from aluminium
in high temperature version. Easy
access at the outer fan casing.
• Silencers with integrated inlet cones
and guide vane to straighten the
airflow. Sound attenuating material:
non-inflammable in accordance with
DIN 4102, corresponding with EU
guideline 97/69.
• Protection guards on inlet and
outlet, manufactured from powder
coated steel.
• Pre-assembled mounting brackets
manufactured from galvanized steel,
for safe and easy ceiling suspension.
• Fan module removable, also when
jet fan unit is installed, for quick
and easy maintenance. Outer jacket
of fan module with quick-lock.
• Deflector/guide vane on the outlet
side.
The Systemair control modules and
regulation systems correspond to
VDI guideline 2053, DIN/VDE 0660,
DIN/VDE 0100-718 and DIN/EN
61140.
The concept has been approved
by TÜV, the modules are CE-labelled.

Safety requires individual planning
CFD simulations
CFD simulations
Systemair offers assistance in the planning
and design of Systemair Jet Fan Systems.
On request and against a fee, which will
be reimbursed when ordering the project
with Systemair, we can provide:
CFD (computational fluid dynamics)
simulations, assisting in selecting the
number, size and positioning of the fans,
and giving all information required for
your specific project.
Checklist
Detailed information is required
regarding the building site. Please ask
for the Systemair checklist for jet fans
and CFD-analyses.
4
Section velocity vectors
Influence of drop beams
Mean age of air

Circular jet fan AJR
Fan unit can be easily removed for inspection
and maintenance
Octagonal jet fan AJ8
Functionality & design
Guide vanes to direct the air flow are available
as accessories for both designs.
5

Technical data
6
Jet fan type Thrust Max. thrust Air Motor Motor Speed Sound level at Weight Tempe-
400V/50Hz (*on) volume rated rated 1 m, from rature
request) power current center of casing
Jet fan type Thrust Max. thrust Air Motor Motor Speed Sound level at Weight Tempe-
400V/50Hz (*on) volume rated rated 1 m, from rature
request) power current center of casing
Air volume related to air density 1.2 kg/m³
* bigger motor capacity
N N m³/h kW A 1/min LpA dB kg
AJR 315-2 23 30 4500 0,75 1,8 2900 69 78 55°C
AJR 315-2/4 23 / 6 30 4500 / 2250 0,75/0,17 1,74/0,63 2860/1420 69 / 54 80 55°C
AJR 355-2 37 53 6400 1,1 2,5 2900 72 84 55°C
AJR 355-2/4 37 / 9 53 6400 / 3200 1,4/0,3 3,13/1,11 2880/1430 72 / 57 86 55°C
AJR 400-2 55 85 8700 1,5 3,3 2840 75 93 55°C
AJR 400-2/4 55 / 14 85 8700 / 4350 1,9/0,4 4,18/1,47 2885/1435 75 / 60 95 55°C
AJR 315-2 (B) 23 30 4500 0,75 1,8 2900 69 78 300°C/2h
AJR 315-2/4 (B) 23 / 6 30 4500 / 2250 0,75/0,15 1,6/0,4 2880/1450 69 / 54 80 300°C/2h
AJR 355-2 (B) 37 53 6400 1,1 2,5 2870 72 84 300°C/2h
AJR 355-2/4 (B) 37 / 9 53 6400 / 3200 1,3/0,25 3,1/0,68 2905/1460 72 / 57 86 300°C/2h
AJR 400-2 (B) 55 85 8700 1,5 3,2 2870 75 93 300°C/2h
AJR 400-2/4 (B) 55 / 14 85 8700 / 4350 1,8/0,37 3,9/0,95 2880/1455 75 / 60 95 300°C/2h
N N m³/h kW A 1/min LpA dB kg
AJ8 315-2 23 30 4500 0,75 1,8 2900 69 82 55°C
AJ8 315-2/4 23 / 6 30 4500 / 2250 0,75/0,17 1,74/0,63 2860/1420 69 / 54 84 55°C
AJ8 355-2 37 53 6400 1,1 2,5 2900 72 88 55°C
AJ8 355-2/4 37 / 9 53 6400 / 3200 1,4/0,3 3,13/1,11 2880/1430 72 / 57 90 55°C
AJ8 400-2 55 85 8700 1,5 3,3 2840 75 97 55°C
AJ8 400-2/4 55 / 14 85 8700 / 4350 1,9/0,4 4,18/1,47 2885/1435 75 / 60 99 55°C
AJ8 315-2 (B) 23 30 4500 0,75 1,8 2900 69 82 300°C/2h
AJ8 315-2/4 (B) 23 / 6 30 4500 / 2250 0,75/0,15 1,6/0,4 2880/1450 69 / 54 84 300°C/2h
AJ8 355-2 (B) 37 53 6400 1,1 2,5 2870 72 88 300°C/2h
AJ8 355-2/4 (B) 37 / 9 53 6400 / 3200 1,3/0,25 3,1/0,68 2905/1460 72 / 57 90 300°C/2h
AJ8 400-2 (B) 55 85 8700 1,5 3,2 2870 75 97 300°C/2h
AJ8 400-2/4 (B) 55 / 14 85 8700 / 4350 1,8/0,37 3,9/0,95 2880/1455 75 / 60 99 300°C/2h
Data subject to change. Data for reversible jet fans on request.

k
L
Lt
tc = sheet thickness fan casing
= sheet thickness
silencer H
k
L
Lt
Dimensions of circular jet fan
Da
tm = sheet thickness
mounting rail
F
E
C
k
L
Lt
tm = sheet thickness
mounting rail
Dimensions of octagonal jet fan
H
F
E
B
tm = sheet thickness
mounting bracket
C
tc = sheet thickness fan casing
tc = sheet thickness fan casing
ts = sheet thickness
silencer
tm = sheet thickness
mounting bracket
ts = sheet thickness
silencer
k
L
Lt
All dimensions in mm.
F
k
L
Lt
tc = sheet thickness fan casing
Dimensions
Size EDa
H E C E F k
C
315 422 431 426.2 259 457.5
355 462 471 444.7 280 476
400 502 513 510 303 540
H
Da
ts = sheet thickness
silencer
Size k L Lt ts tc tm
315 400 00 1 1
355 400 00 1 1
400 400 00 1 1
All dimensions in mm.
tc = sheet thickness fan casing
k
L
Lt
Size H B C E F k
315
355
365 B
395
550
550 C
355
355
E
B 610
610 C
650
650
400 445 600 380 660 700
ts = sheet thickness
silencer
F
E
Size k L Lt ts tc tm
315 476 2200 2213 1 2 2.5
355 476 2200 2213 1 2 2.5
400 476 2200 2213 1 2 2.5
H
H
H
Da
F
F
C
7

Approved safety
Aerodynamic and acoustic
measurements
Systemair jet fans have been
aerodynamically and acoustically tested
on an AMCA rated Systemair test rig.
Temperature and differential pressure
8
The high temperature test has been carried
out at the Technical University in Munich,
in accordance with the latest EN 1 101-
standards. The tests were made with
airflow from motor to impeller.
Aerodynamic measurement
Acoustic measurement

1. Power supply:
2. Main fans:
Inlet fan/Extract fan 1... ... Inlet fan/Extract fan n
3. Jet fans:
Jet fan 1...
4. Central control unit:
Smoke extract/ventilation section 1... ... Smoke extract/ventilation section n
5. CO-alarm signal input:
6. Input for accessories:
Control system
– the system configuration
... Jet fan n
1. Power supply:
Switching cabinet, designed for total power
consumption or for total absorbed current.
2. Switching and control unit for main fans
(dimensioned according to number of fans,
absorbed power of fans, wiring and start-up,
reversibility).
3. Switching and control unit for jet fans
(dimensioned according to number of jet fans,
absorbed power of jet fans, wiring and start-up,
reversibility).
4. Central control unit
(one modul per ventilation/smoke zone,
configurated according to functions).
5. CO-alarm signal input
(CO-alarm system not included)
6. Accessories (optional)
override panel for fire brigade, smoke detectors,
acoustic signals, illuminated alarm boards,…
9

Control system
Modular control system, adapted to the
project requirements. To control fans
for ventilation and smoke extract in
underground car parks, equipped with
main supply/extract fans, jet fans and
sensors.
Clearly laid out concept, functionality
approved by TÜV/Süd Germany.
Single or two speed fans, uni-directional
or reversible can be controlled. Each
jet fan is allocated to an individual
control module. For service and initial
operation each jet fan can be manually
activated.
In normal ventilation mode the system
is being switched depending on CO
alarm systems, on timers or input
from central building control systems.
The fan operates either in high or in
low speed, in the selected direction of
rotation.
In fire mode the system is being switched
depending on the fire detection system.
Virtual smoke extract zones can be
formed, having different directions of
smoke extraction. All fans activated
in the smoke extract zone will
automatically run in the pre-set fan
speed and direction of rotation. The
built in over-current protection of the
motor is deactivated. The fan runs until
it is mechanically destroyed by the fire.
10
Jet fan module
Central control unit
with control panel

Project:
Customer:
1. Supply air
mechanical
If mechanical, then fill in:
Air volume [m³/h]:
Location(s) supply
air fan(s) in drawing:
Corresponding drawing
(file name, format):
2. Exhaust air
mechanical
If mechanical, then fill in:
Air volume [m³/h]:
Location(s) exhaust
air fan(s) in drawing:
Corresponding drawing
(file name, format):
3. Car park
Required air exchange rate [1/h]:
4. Jet fan specification
Medium temperature/time […°C/…h]:
To be used for:
Air volume jet fan [m³/h]:
Outlet velocity jet fan [m/s]:
Thrust [N]:
Two speeds [100/50 %]:
Reversible:
5. Required drawings
Relevant floor plans of the car park
Plan (file name, format):
Checklist
for offers for Jet fans / CFD-analyse
Relevant sectional drawings of the car park
Plan (file name, format):
natural
If natural, then fill in:
Size(s) in m and location(s)
of the openings in the drawing:
Corresponding drawing
(file name, format):
natural
If natural, then fill in:
Size(s) [axb in m] and location(s)
of the openings in the drawing:
Corresponding drawing
(file name, format):
Room volume [m³]:
Smoke extract CO-extract
yes no
yes no
1. .
. 4.
1. .
. 4.
11

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10/06 / E 4081