Drum Jet Diffusers - Scottaire

DIFFUSERS-Drum Jet
DRUM JET DIFFUSERS
These diffusers are designed to handle large air volumes on
comparatively long throws. They are ideally suited for exposed
duct or sidewall applications in large open spaces such as
warehouses, atria, factories, auditoriums, sports halls
(excluding badminton courts) and swimming pools. There are
eight sizes of unit to cover most situations. The angle of
discharge can be adjusted through 60 degrees in one plane.
STANDARD •
Code 0151. Drum jet diffuser.
Code 0150. Diffuser mounted opposed blade damper.
Code 0152. Duct mounted opposed blade damper.
Code 0154. Duct mounted air turn.
Code 0153. Diffuser mounted air turn.
STANDARD SPECIFICATION
OPTIONAL ALTERNATIVES/ADDITIONS
SIZES
The eight units have a nominal height of either
170mm or 271mm. There are four nominal lengths in
the 170mm height i.e. 261mm, 337mm, 490mm and
642mm. There are four nominal lengths in the 271mm
height i.e. 540mm, 667mm, 794mm and 921mm.
CONSTRUCTION
The frame and drum of the diffuser are aluminium
with brush strips to provide a low friction air seal
between them.
FINISH
Silver satin anodised to BS1615 AA5.
OPPOSED BLADE DAMPER.
An opposed blade damper in mill finish aluminium
can be supplied attached to the diffuser (Code
0150) or for duct mounting (Code 0152).
COMBINED AIR TURN, VOLUME
EQUALISER AND CONTROLLER.
A mill finish aluminium combined air turn, volume
equaliser and controller can be supplied attached to
the diffuser (Code 0153) or for duct mounting
(Code 0154).
FINISHES
Any BS or RAL colour in stove enamel paint. Code
0158. Powder coating is not recommended for this
type of diffuser.
FIXINGS
Countersunk screw holes in the border. Size No
6 x 1˝ self tapping screws provided with each diffuser
and painted the same colour as the diffuser. (Fixing
Type OF1).
PACKAGING
Each diffuser is individually wrapped in corrugated
cardboard and then shrink wrapped with cardboard to
top and bottom surfaces.
ORDERING DETAILS
• The code for the basic grille should have 13 digits.
See page 1.
• Please always give length first, then height.
• Add codes for alternatives / additions as suffixes.
EXAMPLE:
A drum jet diffuser to fit a nominal duct size of
261mm long x 170 mm high with an opposed
blade damper attached and stove enamelled to RAL
9010 would be coded
0151/00261/0170+0150+0158 RAL9010 matt.
TECHNICAL INFORMATION
See pages 2 - 5
Applications. Supply * Sidewall *
JD1

DIFFUSERS-Drum Jet
Code 0151 Drum Jet Diffuser
75 Blame Pitch
14
Overall Height ‘B’
Nominal Duct height ‘H’
85 (Size 0170)
150 (Size 0271)
30°
30°
H -5
Nominal Duct height ‘H’
Nominal Duct Width ‘W’
Overall Width ‘A’
‘C’
6
‘D’
146 (Size 0170)
207 (Size 0271)
AIR FLOW
Adaptor Frame
Code 0150 Diffuser Mounted Opposed Blade Damper
Code 0154 Duct Mounted Air Turn
AIR FLOW
42
Max
Code 0152 Duct Mounted Opposed Blade Damper
146 (Size 0170)
207 (Size 0271)
Air Turn
Adaptor Frame
Stub Duct
Code 0153 Diffuser Mounted Air Turn
JD2

DIFFUSERS-Drum Jet
PERFORMANCE DATA FOR
DRUM JET DIFFUSER CODE 0151
• SELECTION EXAMPLE: Size 00642/0170 Drum
Jet supplying an air flow rate of 4001/s. Throw = 17m,
(red line) Noise = NR26 (blue line), Pressure Loss =
45Pa. This example is based on ambient air. Assume
you have a temperature differential of +10°, from rise
and fall/temp differential chart on page 4. 17m throw
at 10° temp differential = 4m rise and fall. From rise
& fall chart on pages 4 - 5, 4m rise and fall to achieve
17m throw = 16° downward angular correction.
PERFORMANCE DATA
TABLE 1
Correction to throw
due to vane adjustments.
Vane
Angle
0°
5°
10°
20°
30°
40°
60°
Throw Factor
1.00
0.90
0.82
0.68
0.60
0.52
0.40
Throws - jet throws are based on isothermal conditions to a terminal velocity of 0.25m/s with straight vanes,
throws should be corrected in accordance with Table 1 to compensate for vane angle adjustments.
Air Flow Rate
1/s m 3 /hr
2000
1500
7000
6000
5000
Jet Throw (m)
to Vt = 0.25m/s
NR level
00261/170
00337/0170
Drum Jet Size
NOISE LEVELS
Noise data is expressed
in terms of NR level
with a room absorbtion
factor of 8db.
1000
900
800
700
600
500
400
300
200
4000
3000
2000
1500
1000
900
800
40
30
20
15
10
5
2
50
45
40
35
30
25
20
15
Static
Pressure
Loss (Pa)
500
250
200
150
100
75
50
25
12
00490/0170
00642/0170
00540/0271
00667/0271
00261/170
00337/0170
00490/0170
00642/0170
00540/0271
700
600
500
00794/0271
00921/0271
00667/0271
00794/0271
00921/0271
100
400
300
200
Use this side for throw
Use this side for NR/Pa
50
JD3

DIFFUSERS-Drum Jet
RISE AND FALL / TEMPERATURE
DIFFERENTIAL FOR
CODE 151 DRUM JET DIFFUSER
PERFORMANCE DATA
120
35
110
100
30
THROW - FEET
90
80
70
60
50
Temp. Diff. 10°F (5.55°C)
Temp. Diff. 20°F (11°C)
THROW - METRES
25
20
15
Temp. Diff. 10°F (5.55°C)
Temp. Diff. 20°F (11°C)
40
30
10
20
5
10
0 10 20 30 40 50
Feet - Rise & Fall
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Metres - Rise & Fall
FEET
METRES
JD4

DIFFUSERS-Drum Jet
RISE AND FALL FOR
CODE 151 DRUM JET DIFFUSER
PERFORMANCE DATA
*Note: Angular correction of drum upwards for - Temperature differential (fall)
Angular correction of drum downwards for + Temperature differential (rise)
Throw
(ft) (m)
Rise or Fall
(ft) (m)
Terminal Velocity =50f.p.m.
Terminal Velocity =0.25m/s
80
0.5
1
0.15
0.2
0.3
200
Drum Jet
Angular
Correction*
0.4
150
50
40
(Degrees)
1
2
0.5
100
50
40
30
20
15
2
3
4
5
6
7
8
10
3
4
5
1.0
1.5
2.0
30
10
15
20
10
3.0
20
8
6
25
30
15
4.0
5
5.0
10
4
3
20
25
30
6.0
7.0
8.0
9.0
10.0
2
40
50
15.0
JD5