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®

PRODUCT BROCHURE

HSC-FD : 042018

HSC-FDFixed Helical Swirl Di�user

The SMARTEMP® Fixed Helical Swirl Diffuser, type

HSC-FD, produces highly inductive swirl discharge,

diffusing the supply air stream radial ly with fixed

horizontal discharge and strong mixing characteristics

into the space. The patent pending design delivers high

levels of draught-free comfort well suited to both

constant volume or VAV applications, inclusive of low

temperature or cold air supply air systems with a

minimum supply-to-room temperature differential of

-16 K including turndown to approximately 25%.

The diffuser comes standard with a square face (figure

1), or may optionally be ordered with a round face.

The cambered leading edges of the twenty off-set radial

vanes reduce the sound power level and pressure drop,

improving aural comfort and saving fan energy.

The vane tips feature helical twist (figure 2) that reduces

pressure drop, allowing the airflow rate to be increased,

thereby reducing the number of diffusers required in the

space. This unique feature also reduces the minimum

DESCRIPTION

Fixed Helical Swirl Di�user

HSC-FD : 042018

Figure 2

Cambered Leading Edge

Helical Twist

Figure 1

permissible VAV turndown to 22% at -12 K cooling or

25% at -16 K (based on 35 Pa maximum tota l

pressure) and enhances stable operation under low

supply air temperature conditions.

The HSC-FD diffuser may be flush mounted in a ceiling

or freely suspended (ie no Coanda attachment to the

ceiling required). Typical discharge height ranges from

2.0 to 4.5 m, depending on diffuser size and airflow.

The highly inductive swirl discharge benefits heating

performance by strongly diluting supply air with cooler

room, thereby diminishing supply air stream buoyancy.

The maximum recommended differential between supply

air and room air is a function of diffuser size, discharge

height and airflow rate.

The HSC-FD swirl vanes form a flush surface with the

surrounding flat diffuser face, which may be square or

round, and which may be optionally screened by a

perforated face. The diffuser is made of powder coated

steel and is available with nominal neck diameters of

250 mm, 355 mm and 500 mm. Optional reducers are

available to reduce effective neck size for decreased

airflow rates.

Reducers

Reducers can be inserted into the neck from behind,

reducing the effective neck size to suit reduced airflow

rates, especially in low air quantity VAV applications

(figure 4). Reducers allow a largely uniform diffuser

aesthetic to be achieved by enabling the use of a

common diffuser size even where airflow rates between

diffusers vary widely. The ability to simply change

reducer s ize a lso prov ides fu ture-proofing for

refurbishment and fit-out changes. Five reducer sizes

are available for size DN500 and six for size DN355.

Reducers are not available for size DN250.

1

Figure 3

CONSTRUCTION

2

3

45

6

7

1 - M6 Rivet Nut

2 - Spigot

3 - Connection Box

4 - M6 Thread Rod

5 - Reducer (Optional)

6 - HSC-FD Swirl Diffuser

7 - Perforated Face (Optional)

Fixed Helical Swirl Di�user 2

HSC-FD : 042018

Figure 5

Discharge Pattern

Segment covers that blank one half, two opposed

quarters, or one quarter of the diffuser vanes are

available to reduce the discharge pattern from 360° to

180 ° (2-way asymmetrical), or 2 x 90 ° (2-way

symmetrical), or 270° (3-way) so as to allow for diffuser

placement in corners, in corridors, or close to a wall,

respectively (figure 5). Segment covers reduce the

diffuser airflow rate. Segment covers may be used in

combination with reducers where further airflow rate

reductions are required.

Mode of Operation

The highly inductive swirl discharge of the HSC-FD

produces rapid discharge velocity decay as the total

supply air stream mass flow rate increases due to

strong entrainment of secondary air from the room into

the primary air stream. Effective air changes per hour

are increased. Consequently, at any given airflow rate,

the HSC-FD swirl diffuser is suitable both for long

throws (due to the high momentum of the supply air

stream) as well as short throws (due to the air stream's

low velocity) making it an extremely adaptable diffuser,

well suited to a broad range of applications and fit-out

changes. Strong dilution of the supply air stream with

large quantities of room air provides rapid supply air

stream temperature equalisation – and hence density

equalisation – with room air, preventing cold air

dumping in summer and min imis ing warm a i r

stratification in winter. The resultant low velocity room air

motion with uniform temperature distribution throughout

the occupancy space produces high levels of thermal

comfort (no cold and draughty or hot and stagnant

spots).

Reducer

Figure 4

3w: 3-way blow2s: 2-way symmetrical blow2a: 2-way asymmetrical blow


HSC-FD : 042018

1 • DN ≤ x ≤ 3 • DNCentre-line spacing to wall:

x

x

x

x x

DN

H1

E

D4

D5

Nominaldiameter

DN Ceiling grid Reducer size ∆T=-12 K with perf. ∆T=-10 K[L/s]V

Volume flow rateØ D5 H1 H2 D4 Air Outlet

Dimensions in mm Weight in kgConnection

BoxDN 250

DN 355

DN 500

300 199

249 340

349460

5002.0to

3.0

2.7to

3.6710

37

52

4.8

7.4

250 25 355 1.2 3.5

45050060024”

60024”

00123456012345

1 - HSC-FD-C - circular face

2 - HSC-FD-S - square face

3 - Foam connection box with magnetic fasteners

4 - Threaded rod

5 - Cap1

2

4

3

5

E

295

44549559523.75”

59523.75”

H2

TECHNICAL DATA


HSC-FD : 042018

D2

395

560

270

D2

1) Vmax based on 35 Pa maximum Total Pressure.2) Larger sizes available on request.3) Perforated face adds 3 dB and increases pressure loss by 10%.

∆T=-16 K[L/s]V [L/s]V

299

199

149

399

299

32-10855-22148-19240-15834-12223-9016-6212-44

110-43999-38992-35475-29257-21839-151

27-10848-22142-19235-15830-12220-9014-6210-4496-43986-38980-35465-29250-21834-151

49-92101-20281-17172-14558-11642-8428-5622-40

198-385174-360158-317128-256103-20666-140

1)

2)

3)

Products supplied may differ slightly from those described in this technical brochure due to on-going product development.


HSC-FD : 042018

NO

TES

TO N

OM

OG

RA

MS

ON

PA

GES

5 &

7

Ther

mal

Com

fort

Gui

de:

AD

PI ≥

95%

: Pr

emiu

m c

omfo

rt s

eden

tary

act

ivity

, suc

h as

in a

udito

ria.

AD

PI ≥

90%

: H

igh

com

fort

nea

r-se

dent

ary

activ

ity, s

uch

as in

boa

rd ro

oms,

hig

h en

d of

fices

and

libr

arie

s.A

DP

I ≥ 8

0%:

Goo

d co

mfo

rt n

ear-

sede

ntar

y ac

tivity

, suc

h as

in o

pen-

plan

offi

ces

and

mee

ting

room

s.A

DP

I ≥ 7

0%:

Stan

dard

com

fort

med

ium

act

ivity

, suc

h as

in tr

ansi

ent s

pace

s, re

tail

and

lobb

ies.

Com

men

ts /

Nom

ogra

m v

alid

for:

Adju

stm

ents

:

360°

dis

char

ge p

atte

rn (4

-way

blo

w).

For 2

70°

disc

harg

e (3

-way

blo

w):

M

ultip

ly a

ctua

l airf

low

rate

by

1.33

to

de

term

ine

perfo

rman

ce fr

om n

omog

ram

.

Fo

r 180

° or

2 x

90°

dis

char

ge (2

-way

blo

w):

M

ultip

ly a

ctua

l airf

low

rate

by

2 to

dete

rmin

e pe

rform

ance

from

nom

ogra

m.

∆T

+ve

den

otes

hea

ting.

Hea

ting

valid

for 1

00%

hig

h-le

vel r

etur

n.

For l

ow-le

vel r

etur

n:

∆Tm

ax.h

eatin

g ≈ (1

+ (L

RA%

)/100

) • ∆

T max

, whe

re L

RA%

= %

low

leve

l ret

urn.

Valid

for d

isch

arge

from

clo

sed

ceilin

g.

For f

reel

y-su

spen

ded

diffu

ser:

Hea

ting

∆Tm

ax.fr

eely

sus

pend

ed ≈

∆T m

ax.h

eatin

g / 1

.2

Tota

l pre

ssur

e (P

t) is

incl

usiv

e of

sid

e-en

try c

onne

ctio

n bo

x pr

essu

re lo

ss.

For h

eigh

t ≤ 2

.7 m

sel

ect 2

.7; o

ther

wis

e se

lect

hei

ght t

wic

e (o

nce

in th

e gr

ey z

one;

onc

e in

the

whi

te z

one)

.

∆T

-ve

deno

tes

cool

ing.

Min

imum

spa

cing

bet

wee

n tw

o di

ffuse

rs (C

min) i

s to

be

halv

ed fo

r spa

cing

to w

alls

or g

lazi

ng.

∆T -v

e de

note

s co

olin

g. M

axim

um s

paci

ng b

etw

een

two

diffu

sers

(Cm

ax) i

s to

be

halv

ed fo

r spa

cing

to w

alls

or g

lazi

ng.

Det

erm

ine

Cm

ax tw

ice

(onc

e ba

sed

on c

oolin

g ∆T

; onc

e ba

sed

on d

isch

arge

hei

ght),

then

sel

ect t

he lo

wer

of t

he tw

o ou

tput

s.

Se

lect

des

ired

com

fort

leve

l to

dete

rmin

e m

inim

um a

nd m

axim

um s

paci

ng (C

min &

Cm

ax) a

nd m

inim

um d

isch

arge

hei

ght (

Hm

in).

Hm

in fo

r dis

char

ge fr

om c

lose

d ce

iling

. Fo

r fre

ely-

susp

ende

d di

ffuse

r:

Hm

in.fr

eely

sus

pend

ed ≈

Hm

in •

1.1

Soun

d pr

essu

re le

vel L

P [N

C] i

s va

lid p

er d

iffus

er in

a s

tand

ard

com

mer

cial

offi

ce o

nly

with

a 2

.7 m

to 3

m c

eilin

g. L

P sh

ould

not

be

used

for s

pace

s ot

her t

han

offic

es, b

ut s

houl

d, in

stea

d be

cal

cula

ted

by a

n ac

oust

ical

eng

inee

r.

1 2 9 5 7 6 8 3

3 m

4 m

5 m

2.7

m

DN25

0

22

H min

[m]

37

16

4.5

6

240 30

40

50

60

70

80

90

10

0

120

140

160

180

200

220

L W

L P*

L/s

3 23

20

10

-16

K

-12

K

-8 K

H =

2.5

3.5

m

3.0

2.7

4 10

20

30 28

33

20

10

C max

2.3

2.5

2.4

2.2

2

2.7

10

20

800

600

500

400

300

200

100

700 40

m3 /h

24

30

40

50

9 15

25

35

Soun

d Po

wer

, LW

[dB(

A)]

Soun

d Pr

essu

re, L

P [N

C]*

2.3

2.1

2.0

2.6

2.4

2.3

2.4

2.5

2.2

2.3

2.1

2.2

HSC-

FD-D

N25

0 &

DN

355-

R0 to

R6

20

10

2.42

17

DN25

0 0 2 3 4 5 6 1

Redu

cer

6 1 2 3 5 0

+20

K

+16

K

+12

K

+8 K

+4 K

0 K

[dB(

A)]

[NC]

[m]

[Pa]

0.6

1 1

3 0.

8

3

3.2 -8

K

-12

K

2 1

4.2 -1

6 K

4

2 3

3

C min

2

Tota

l Pre

ssur

e, P

t [Pa

]

2 4

5 1

DN25

0

2

1 0

3 4 5 6

[m]

5.2

0.7

3

3.5 3.

1

10

60

30

40 5

0

5 m

≤2.7

m

H

= 2

m

4

20

P t

∆T

[K] = 4

Cool

ing

H =

5 m

DN25

0 DN

355

1 2 5

6 7 9

3

Cool

ing ∆T

=

Cool

ing

∆T [K

] =

ADPI

≥ 9

0%; ṽ

≤ 0

.25

m/s

; DR ≈

20%

@ T

=26°

C:

ADPI

≥ 8

0%; ṽ

≤ 0

.29

m/s

:

ADPI

≥ 7

0%; ṽ

≤ 0

.33

m/s

; DR ≈

30%

@ T

=26°

C:

ADPI

≥ 9

5%; ṽ

≤ 0

.20

m/s

:

: Heati

ng

∆Tm

ax [K

] L/

s/m

2 ≤2

5 ≥1

0

+11

Not

es:

* Ba

sed

on 1

0 dB

room

abs

orpti

on.

8

170

+18

K

+14

K

+10

K

+6 K

+2 K

4


HSC-FD : 042018

REF

ER T

O N

OTE

S O

N P

AG

E 4


HSC-FD : 042018

EXAM

PLE:

HSC

-FD

-DN

355-

3w in

an

offic

e D

eter

min

e th

e pe

rform

ance

par

amet

ers

of a

n H

SC-F

D-D

N35

5 w

ith n

o re

duce

r ope

ratin

g at

128

L/s

and

inco

rpor

atin

g a

blan

king

seg

men

t to

prod

uce

a 27

0° d

isch

arge

pat

tern

(3-w

ay b

low

) fro

m a

2.7

m h

igh

clos

ed c

eilin

g, s

uppl

ying

5 L

/s/m

2 to

a pr

emiu

m o

ffice

with

100

% h

igh-

leve

l re

turn

air.

The

sup

ply-

to-r

oom

tem

pera

ture

diff

eren

tial w

hen

cool

ing

is -1

2 K.

Due

to th

e 27

0° d

isch

arge

pat

tern

, mul

tiply

the

actu

al a

irflo

w ra

te o

f 120

L/s

by

1.33

, pro

vidi

ng 1

70 L

/s fo

r inp

ut in

to th

e no

mog

ram

.

Se

lect

no

colla

r (R

educ

er 0

).

Sele

ct 2

.7 m

dis

char

ge h

eigh

t and

5 L

/s/m

2 spe

cific

airf

low

, res

ultin

g in

a m

axim

um h

eatin

g te

mpe

ratu

re d

iffer

entia

l (∆T

max

) of +

11 K

.

The

tota

l pre

ssur

e (P

t) is

20

Pa, i

nclu

sive

of s

ide-

entry

con

nect

ion

box

pres

sure

loss

.

Sele

ct 2

.7 m

dis

char

ge h

eigh

t, w

hich

is c

omm

on to

bot

h th

e gr

ey z

one

and

the

whi

te z

one.

Sele

ct -1

2 K

cool

ing.

Sele

ct -1

2 K

cool

ing

and

2.7

m d

isch

arge

hei

ght.

Fo

r a p

rem

ium

offi

ce, s

elec

t AD

PI =

90%

. Th

e m

inim

um re

com

men

ded

cent

re-li

ne d

ista

nce

(Cm

in) b

etw

een

two

adja

cent

diff

user

s is

3.

2 m

; and

hen

ce 1

.6 m

to w

alls

that

the

diffu

ser d

isch

arge

s to

war

ds.

The

min

imum

reco

mm

ende

d di

scha

rge

heig

ht (H

min) i

s 2.

42 m

. Th

e m

axim

um re

com

men

ded

cent

re-li

ne d

ista

nce

(Cm

ax) i

s 16

m (i

e th

e lo

wer

of 1

6 m

for 2

.7 m

dis

char

ge h

eigh

t and

17

m fo

r -12

K c

oolin

g);

and

henc

e 8

m to

wal

ls th

at th

e di

ffuse

r dis

char

ges

tow

ards

.

Th

e A-

wei

ghte

d so

und

pow

er le

vel (

L W) o

f the

diff

user

is 3

7 dB

(A),

prod

ucin

g a

soun

d pr

essu

re le

vel (

L P) o

f NC

22

in th

e sp

ace

(bas

ed o

n 10

dB

room

abs

orpt

ion)

.

1 2 3 5 6 7 8 9


HSC-FD : 042018

REF

ER T

O N

OTE

S O

N P

AG

E 4

3 m

4 m

5 m

H min

[m]

5 m

10

30

10

5 6

5.0

m

3.0

H =

2.5 38

7

L W

L P*

20

10

-16

K

-12

K

-8 K

20 30

45 55

20

C max

2.4

2.6

2.5

2.3

10

24

30

40

50

9 15

25

35

Soun

d Po

wer

, LW

[dB(

A)]

Soun

d Pr

essu

re, L

P [N

C]*

2.4

2.2

2.1

2.7

2.5

2.4

2.5

2.6

2.3

2.4

2.2

2.3

0 2 3 4 5 1

Redu

cer 1 2 3 4 5 0

+20

K

+16

K

+12

K

+8 K

+4 K

[dB(

A)]

[NC]

480 60

80

10

0 12

0 14

0 16

0 18

0 20

0

240

280

320

360

400

440

L/s

1600

1200

1000

800

600

400

200

1400

80

m3 /h

HSC-

FD-D

N50

0

40

20

4 20

33

30 30

[m

] 4.0

40

40 5

0 4.

5

5.2

4

[Pa]

0.7

1 1

3

6 -8 K

-1

2 K

2 1

6.2 -1

6 K

6

2

3

C min

2

Tota

l Pre

ssur

e, P

t [Pa

]

2 8 2

1 0

3 4 5

[m]

1.3

0.8 10

60

30

40

50

18

20

4 5

4

3 5

4

≤2.7

m

40

H =

2 m

Co

olin

g ∆T

=

Cool

ing

∆T [K

] =

P t

∆T

[K] = 4

Cool

ing

H =

5 m

1 2 5

6 7 9

3

12

7.0

25

ADPI

≥ 9

0%; ṽ

≤ 0

.25

m/s

; DR ≈

20%

@ T

=26°

C:

ADPI

≥ 8

0%; ṽ

≤ 0

.29

m/s

:

ADPI

≥ 7

0%; ṽ

≤ 0

.33

m/s

; DR ≈

30%

@ T

=26°

C:

ADPI

≥ 9

5%; ṽ

≤ 0

.20

m/s

:

: Heati

ng

∆Tm

ax [K

] L/

s/m

2 ≤2

5 ≥1

0

8

2.7

m

Not

es:

* Ba

sed

on 1

0 dB

room

abs

orpti

on.

+18

K

+14

K

+10

K

+6 K

+2 K

0

K

4


HSC-FD : 042018

EXAM

PLE:

HSC

-FD

-DN

500

in a

n au

dito

rium

D

eter

min

e th

e pe

rform

ance

par

amet

ers

of H

SC-F

D-D

N50

0 di

ffuse

rs w

ith n

o re

duce

r, ea

ch fr

eely

sus

pend

ed a

t 5 m

hei

ght a

nd d

isch

argi

ng

320

L/s,

sup

plyi

ng 5

L/s

/m2 to

an

audi

toriu

m w

ith 1

00%

hig

h le

vel r

etur

n ai

r. T

he s

uppl

y-to

-room

tem

pera

ture

diff

eren

tial w

hen

cool

ing

is -1

6 K.

Sele

ct 3

60 L

/s fo

r inp

ut in

to th

e no

mog

ram

.

Se

lect

no

colla

r (R

educ

er 0

).

Sele

ct 5

m d

isch

arge

hei

ght a

nd 5

L/s

/m2 s

peci

fic a

irflo

w, r

esul

ting

in a

max

imum

hea

ting

tem

pera

ture

diff

eren

tial (

∆Tm

ax) o

f +2

K. A

s th

e di

ffuse

r is

freel

y su

spen

ded,

∆T m

ax.fr

eely

sus

pend

ed ≈

∆T m

ax.h

eatin

g

air w

ill on

ly in

crea

se ∆

T max

.free

ly s

uspe

nded

to +

3.3

K, w

hich

is n

ot s

uffic

ient

for h

eatin

g. C

onsi

der u

sing

the

Smar

tem

p H

SC-A

D in

stea

d if

heat

ing

is re

quire

d.)

Th

e to

tal p

ress

ure

(Pt)

is 1

8 Pa

, inc

lusi

ve o

f sid

e-en

try c

onne

ctio

n bo

x pr

essu

re lo

ss.

Se

lect

5 m

dis

char

ge h

eigh

t tw

ice

(onc

e in

the

grey

zon

e; o

nce

in th

e w

hite

zon

e).

Se

lect

-16

K co

olin

g.

Se

lect

-16

K co

olin

g an

d 5

m d

isch

arge

hei

ght.

Fo

r an

audi

toriu

m, s

elec

t AD

PI =

95%

. Th

e m

inim

um re

com

men

ded

cent

re-li

ne d

ista

nce

(Cm

in) b

etw

een

two

adja

cent

diff

user

s is

7.0

m;

and

henc

e 3.

5 m

to w

alls

. Th

e m

inim

um re

com

men

ded

disc

harg

e he

ight

(Hm

in) i

s 2.

6 m

. Th

e m

axim

um re

com

men

ded

cent

re-li

ne

dist

ance

(Cm

ax) i

s 12

m (i

e th

e lo

wer

of 1

2 m

for -

16 K

coo

ling

and

25 m

for 5

m d

isch

arge

hei

ght);

and

hen

ce 6

m to

wal

ls.

The

A-w

eigh

ted

soun

d po

wer

leve

l (L W

) per

diff

user

is 3

8 dB

(A).

As

this

is a

larg

e vo

lum

e au

dito

rium

(and

not

an

offic

e, w

hich

typi

cally

ha

s ap

prox

imat

ely

10 d

B ro

om a

bsor

ptio

n) th

e so

und

pres

sure

leve

l (L P

) bas

ed o

n 10

dB

room

abs

orpt

ion

shou

ld n

ot b

e us

ed (i

e on

ly L

W

shou

ld b

e pr

ovid

ed fo

r aco

ustic

al c

alcu

latio

ns).

1 2 3 5 6 7 8 9

/ 1.2

≈ +1

.7 K

, bas

ed o

n 10

0% h

igh

leve

l ret

urn

air.

(Eve

n 10

0% lo

w le

vel r

etur

n

• ∆Tsupply-room ≥ -16 K (cooling); ≤ +12 K (heating), depending on application.

• Well suited to low temperature VAV systems with minimum ∆Tsupply-room = -16 K including turndown to 25%.

• Discharge height: 2.4 m to 4.5 m.

• Diffuse airflow from fixed stable horizontal swirl discharge pattern for high thermal comfort.

• 20 off-set radial vanes flush with flat diffuser face.

• Diffuser face may be square or round.

• Optional perforated screen.

• For installation substantially flush with suspended false ceiling or freely suspended.

• Vanes with cambered leading edges to reduce both noise and pressure drop.

• Helical twist vane tips for increased airflow rate range of operation.

• Available in 3 neck sizes: DN250; DN355; DN500.

• Low sound power level and pressure loss.

• Suitable for high airflow rates.

• Optional reducers for low airflow rates (DN355 and DN500 only).

• Segments covers (1/4; 2/4 opposed; 1/2) for diffuser placement near walls, in corridors or in corners.

• Diffuser made of powder coated sheet metal.

• Central optional threaded rod fastener with flush cap.

• Optional foam connection boxes, including magnetic perimeter edges and central connection nuts,

stackable for storage and transport.


HSC-FD : 042018

FEATURES

Note:* Standard, if no type code entered.1 Other face sizes available on request.Products supplied may differ slightly from those described inthis technical brochure due to on-going product development.

HSC-FD-DN___-___-R__-__-P__-__-__CONNECTION TYPE:- 0* = No connection box.- KF = Thermally insulated foam connection box with magnetic fastener & blanking cap.- KFR = As for KF plus threaded rod fastener and cap.

REDUCER:- 0* = No reducer- 1 – 6 = Reducers 1 to 6 for size DN355.- 1 – 5 = Reducers 1 to 5 for size DN500.

FACE FINISH:- 0* = No perforated face.- 1 = Perforated face.

SURFACE FINISH:- 9003* = Face powder coated to RAL 9003 (Signal White).- 9005* = Face powder coated to RAL 9005 (Jet Black).- _____= Face powder coated to RAL ___ .

DISCHARGE PATTERN:- 4w* = No blanking segments.- 3w = 1/4 blanking segment – for diffuser adjacent to wall.- 2s = 2/4 blanking segments – for diffuser in corridor.- 2a = 1/2 blanking segment – for diffuser in corner.

FACE SHAPE:- S*= Square face with 90° turn-up for coffered ceilings: - 295 mm1 for size DN250; - 595 mm* (445 mm to 603 mm [23.75”] available) for size DN355; - 595 mm* to 603 mm [23.75”] for size DN500.- C = Circular face with flush contact edge (4 mm / 30°) for closed false ceilings: - Ø 355 mm* for size DN250; - Ø 500 mm* for size DN355; - Ø 710 mm* for size DN500.

MODEL:- Helical Swirl Ceiling - Fixed Direction

NOMINAL DIAMETER:- DN250 = Nominal neck diameter 250 mm.- DN355 = Nominal neck diameter 355 mm.- DN500 = Nominal neck diameter 500 mm.


HSC-FD : 042018

ORDER DETAILS

Furnish and install SMARTEMP® Fixed Helical Swirl Diffusers, type HSC-FD, to provide diffuse airflow with fixed stable

horizontal swirl discharge pattern for the provision of high thermal comfort. Each diffuser is to be made of powder coated

steel and shall include 20 off-set radial vanes flush with the flat diffuser face. The diffuser shall be installed complete with

a flush colour matching central cap and shall be suitable for central threaded rod connection. The diffuser face is to be

square or round, as specified, and is to be fitted with the optional perforated screen where indicated. The diffuser is to be

installed substantially flush with the suspended false ceiling or freely suspended, as specified. Swirl vanes are to include

cambered leading edges for reduced noise and pressure drop, and helical swirl vane tips are each to have geometric

twist to increase the airflow rate range of operation. Diffuser neck size is to be DN250, DN355 or DN500, as

appropriate. Fit optional reducers where low airflow rates are required (DN355 and DN500 only). Install the diffusers at a

discharge height of 2.4 to 4.5 m. For VAV applications, operate each diffuser within an airflow rate band turning down to

no less than 25% at a ∆Tsupply-room ≥ -16 K. For heating applications, observe ∆Tsupply-room recommendations.

Install segments covers (1/4; 2/4 opposed; 1/2) for diffuser placement near walls, in corridors or in corners. Connect

each diffuser to SMARTEMP foam connections boxes, suitable for perimeter magnetic and/or central threaded rod

connections, as specified.


HSC-FD : 042018

TENDER TEXT

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