Brochure
S Series (Page 43-47)
NOTES:
1. Table 1 based on 4-foot diffuser length. For longer lengths, cor-
rect throw and NC per Table 2.
2. For 2-way ceiling throw, proportion cfm and number of slots in
each direction of T and select from 1-way data, Table 1.
3. When using continuous diffuser lengths with alternate active and
inactive sections, a reduction in throw can be obtained by omitting
the factors contained in Table 2.
4. P
s
constant for horizontal 1-way, 2-way and vertical pattern
adjustment.
5. Supply air temperature effect on horizontal throw is shown in Table
3. Vertical throw at varying supply air temperatures is shown in
Table 4.
6. Terminal velocities (V
t
) at the minimum and maximum throw (T)
positions are rated at 150 FPM and 100 FPM respectively with
corresponding room velocities (V
r
) of 50 FPM and 35 FPM.
1' MAX.
CASE 1
T
5' MIN.
CASE 2
AIR MEASUREMENT
SUPPLY HORIZONTAL SUPPLY VERTICAL RETURN AIR
VELOMETER JET FOR V
k
VELOCITY
Ceiling
Min.-Max.
Sidewall
Min.-Max.
Sill
Min.-Max.
4-6 + 0
7-20 + 5
21-100 + 10T x 1.15
Throw (T)
Modify Table 1 by listed values
for diffuser lengths above 4 feet.
Table 2 - Continuous Diffuser Length Factors
Diffuser
Length
in Feet NC
No change
T x 1.10
1 2 3 4 5 6 7 8 9 10
A
k
Area .02 .03 .05 .07 .09 .10 .12 .14 .15 .17
A
n
Area .08 .17 .25 .33 .42 .50 .58 .67 .75 .84
1 2 3 4 5 6 7 8 9 10
A
k
Area .03 .05 .07 .09 .12 .14 .16 .19 .21 .23
A
n
Area .12 .24 .36 .48 .60 .72 .84 .96 1.10 1.20
1 2 3 4 5 6 7 8 9 10
A
k
Area .04 .06 .09 .12 .15 .18 .21 .24 .27 .30
A
n
Area .17 .33 .50 .67 .83 1.00 1.17 1.33 1.50 1.67
A
k
constant for horizontal 1-way, 2-way, and vertical pattern.
CFM = A
k
x length in feet x V
k
Type 10 Supply Diffuser Areas per Foot of Length
No. of Slots
Type 50 Supply Diffuser Areas per Foot of Length
No. of Slots
Type 75 Supply Diffuser Areas per Foot of Length
No. of Slots
Type 50 Return Air CFM per Foot of Length*
-.02" P
s
CFM
-.03" P
s
CFM
-.08" P
s
CFM
-.10" P
s
CFM
-.15" P
s
CFM
-.20" P
s
CFM
1 .03 15 20 30 35 40 45
2 .06 35 45 70 80 95 110
3 .08 55 70 110 125 150 175
4 .11 70 85 140 155 190 220
5 .14 90 110 180 200 245 285
6 .16 110 135 220 245 300 345
7 .20 130 160 260 290 355 410
8 .22 140 170 280 310 385 440
9 .25 165 200 330 370 450 520
10 .28 185 225 370 415 505 585
Type 75 Return Air CFM per Foot of Length*
-.02" P
s
CFM
-.03" P
s
CFM
-.08" P
s
CFM
-.10" P
s
CFM
-.15" P
s
CFM
-.20" P
s
CFM
1 .04 25 35 50 65 75 90
2 .08 50 60 100 110 135 160
3 .12 80 100 160 180 220 250
4 .16 100 120 200 225 275 320
5 .20 130 160 260 295 360 420
6 .24 160 195 320 360 440 510
7 .28 175 215 350 390 475 550
8 .32 200 245 400 445 545 630
9 .36 235 290 470 525 640 740
10 .40 260 320 520 580 710 820
Type 10 Return Air CFM per Foot of Length*
-.02" P
s
CFM
-.03" P
s
CFM
-.08" P
s
CFM
-.10" P
s
CFM
-.15" P
s
CFM
-.20" P
s
CFM
1 .06 35 43 70 80 95 110
2 .11 70 85 140 155 190 220
3 .17 105 130 210 235 285 330
4 .23 140 170 280 310 380 440
5 .28 175 215 350 390 475 550
6 .33 210 255 420 465 570 660
7 .39 245 300 490 545 665 770
8 .44 280 340 560 620 760 880
9 .50 315 385 630 700 855 990
10 .55 350 425 700 775 950 1100
NC 30
Application Ducted
NC 35-40
Application Ducted
No.
of
Slots
A
k
Area
NC 20-25
Application Nonducted
NC 30
Application Ducted
* Capacity based on diffuser without pattern controller. When pattern controller
is used, CFM capacities are reduced by 65% at listed P
s
, NC, and A
k
.
NC 30
Application Ducted
NC 35-40
Application Ducted
No.
of
Slots
A
k
Area
NC 20-25
Application Nonducted
NC 35-40
Application Ducted
No.
of
Slots
A
k
Area
NC 20-25
Application Nonducted
@-20F T @ 0F T @+25F T
T x 1.00 T x 1.10 T x 1.20
Case
@-20F T
Cooling
@ 0F T
Ventilating
@+25F T
Heating
Case 1 T x 1.00 T x .90 T x .60
Case 2 T x .70 T x .60 T x .40
Table 3 - Supply Air Temperature Factors
Multiply Throw in Table 1
(or factor in Table 2 if used) by listed value.
Ceiling
Sidewall
Sill
Multiply Throw-Sidewall in Table 1
(or factor in Table 2 if used) by listed value.
Table 4 - Vertical Down-Throw and
Supply Air Temperature Factors
Recommended Noise Criteria and Face Velocity Ranges are on page 75
Engineering Data
105
Engineering Data