Bryant 581A User Manual
Page 18
SOUND POWER (Total Unit)
UNIT
581A
SOUND
RATING-BELS
(60 Hz)
A-WEIGHTED
(dB)
OCTAVE BANDS
63
125
250
500
1000
2000
4000
8000
155
8.8
87.3
87.1
89.9
86.4
84.0
82.7
79.0
73.9
68.6
180
8.9
88.0
95.7
88.9
87.2
85.2
91.9
79.5
72.7
66.0
240
9.5
94.1
90.6
87.2
89.9
86.2
85.8
81.0
75.6
69.6
Bels — Sound Levels (1 bel = 10 decibels)
NOTE: All values are in dB unless otherwise noted.
AIR QUANTITY LIMITS
UNIT 581A
MINIMUM CFM
MAXIMUM CFM
155
3750
6,250
180
4500
7,500
240
6000
10,000
ACCESSORY/FIOP ECONOMIZER STATIC PRESSURE (in. wg)
UNIT
581A
UNIT
VOLTAGE
CFM
ECONOMIZER
PRESSURE DROP
155,180
All
3,750
.03
4,000
.03
5,000
.05
6,000
.07
7,500
.10
240
All
6,000
.07
7,200
.09
9,000
.11
10,000
.12
LEGEND
FIOP — Factory-Installed Option
NOTES:
1. The factory-assembled horizontal adapter substantially improves fan performance. See graph on
page 17.
2. The static pressure must be added to external static pressure. The sum and the evaporator
entering-air cfm should then be used in conjunction with the Air Delivery table to determine blower
rpm, bhp, and watts.
Fan Performance Using Accessory Power Exhaust
18