Catalog
Number
Notes
FEATURES & SPECIFICATIONS
Type
INTENDED USE — High performance deep-cell parabolic luminaires for superior light control, visual
comfort and light cutoff in open area applications.
ATTRIBUTES — Choice of diffuse or specular louvers utilize the latest developments in louver finishing
for minimized louver iridescence.
PARAMAX® Parabolic Troffer
CONSTRUCTION — 20"x2' models also available using straight, U-bent or compact lamps.
Optional side-pans kit available for use in 2'x4' and 5'x5' ceiling openings.
PM3 20"X4'
Black reveal provides floating louver appearance, conceals optional air-supply slots. Optional heat-removal
dampers and air-pattern control blades allow airflow control.
Overlapping flange and modular ceiling trims factory-installed with standard swing-gate hangers or field
convertible with optional trim and hangers. T-hinges die-formed for maximum strength. Latches springloaded, concealed in reveal.
3" LOUVER
Housing formed from cold-rolled steel. Louvers formed from anodized aluminum. No asbestos is used in
this product.
FINISH — Five-stage iron-phosphate pretreatment ensures superior paint adhesion and rust resistance.
Painted parts finished with high-gloss, baked white enamel.
ELECTRICAL SYSTEM — Thermally-protected, resetting, Class P, HPF, non‑PCB, UL Listed, CSA certified
ballast is standard. Ballasts are sound rated A.
Luminaire is suitable for damp locations. AWM, TFN or THHN wire used throughout, rated for required
temperatures.
LISTING — UL Listed (standard). CSA Certified or NOM Certified (see Options).
Specifications
48
(121.8)
Length: 48 (121.8)
WARRANTY — 1-year limited warranty. Complete warranty terms located at
www.acuitybrands.com/CustomerResources/Terms_and_conditions.aspx
Width: 20 (50.8)
Depth: 5-15/16 (15.1)
Actual performance may differ as a result of end-user environment and application.
Note: Specifications subject to change without notice.
Weight: 35 lbs (16 kg)
All dimensions are inches (centimeters).
ORDERING INFORMATION
20PM3 Paramax
3" deep
cell
parabolic,
20" wide
32
Trim type
Air function
G
F
Grid
Overlapping
flange
MT Modular
fit-in
A Air supply/
return (slots in
side trim)
H Heat removal
(through lamp
cavity, dampers
available)
D Combination
A&H
B Static (no
air function,
matching
appearance)
Number
of lamps
2
3
4
Not
included
Accessories: Order as separate catalog number.
20EB6 Extension bracket and filler pans for 60"x20" ceiling systems.
Provides fixture support.
4FP2 Two white 48" side filler pans for G trim fixture. For 2'x4' ceiling modules.
FLUORESCENT: 20
(50.8)
Example: 20PM3 G B 2 32 12LD MVOLT GEB10IS
For shortest lead times, configure product using standard options (shown in bold).
20PM3
Series
5-15/16
(15.1)
Lamp type
32
32W T8
(48")
Number
of cells Finish
12
16
18
24
Voltage
LD Low
iridescent
anodized
diffuse
silver
LS Low
iridescent
anodized
specular
silver
120
277
347
MVOLT1
Others
available
Options
1/3
1/4
GEB10IS
GEB10RS
EL
One 3-lamp ballast
One 4-lamp ballast
Electronic ballast, <10% THD, instant start
Electronic ballast, <10% THD, rapid start
Emergency battery pack (nominal 300
lumens)
EL14
Emergency battery pack (nominal 1400
lumens)
LST
Tandem fixture pairs (shared ballasts)
PWS1836 6' prewire, 3/8" diameter, 18-gauge,
1 circuit
GLR
Internal fast-blow fuse2
GMF
Internal slow-blow fuse2
LP835
Lamped; 800-series, 3500K
LP__
Lamped, specify lamp type and color
APB
Air-pattern control blades (A & D models only)
PAF
Painted after fabrication (white enamel)
JP
Palletized and stretch-wrapped, GT and
MT trim only
CSA
Listed and labeled to comply with Canadian
standards
NOM
Listed and labeled to comply with Mexican
standards
Notes
1 MVOLT standard for 120V and 277V applications, some options require voltage specified.
2 Must specify voltage.
PM3-20X4
PM3 20"x 4' 3" Louver Family
MOUNTING DATA
DIMENSIONS
Continuous row mounting of flanged units requires CRE and CRM trim options (see Options).
All dimensions are inches (centimeters).
Ceiling type
Appropriate trim type
G
G
F, MT
MT
FT
Exposed grid tee
Concealed grid tee
Concealed Z-spline
Metal pan (consult factory)
Acoustical tile, plaster or plasterboard on
rigid support parallel to lamps
3 4-1/16
(7.6) (10.3)
5-15/16
(15.1)
20
(50.8)
3 4-1/16
(7.6) (10.3)
7-1/8
(18.1)
20
(50.8)
3 4-1/16
(7.6) (10.3)
5-5/16
(13.5)
Notes
1 Recommended rough-in dimensions for F trim fixtures 20"x48" (Tolerance is +1/4", -O”).
Swing-gate range 1" to 4-3/16", span 23-1/2" to 26-5/16".
5-15/16
(15.1)
20
(50.8)
5-15/16
(15.1)
2-1/8
(5.4)
PHOTOMETRICS
Calculated using the zonal cavity method in accordance with IESNA LM41 procedures. Floor reflectances are 20%. Lamp configurations shown are typical.
Full photometric data on these and other configurations available upon request.
20PM3 G 2 32 12LS
Report LTL 5763 – Lumens per lamp = 2900
S/MH (along) 1.2 (across) 2.1 Coefficient of Utilization
20PM3 G B 3 32 18LD
Report LTL 5585 – Lumens per lamp = 2900
S/MH (along) 1.2 (across) 1.5 Coefficient of Utilization
Wall 70%50%30% 70%50%30% 50%30%10%
Wall 70%50%30% 70%50%30% 50%30%10%
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
Ceiling80%
909090
858279
797470
736661
676054
625347
574841
524236
483831
433327
403024
70%
888888
838078
777369
716561
665953
605247
554741
514236
463731
423327
393024
50%
848484
777574
706764
635956
575249
514642
464036
413531
363127
322723
292420
Ceiling80%
818181
767472
716764
666157
625550
575045
534540
494135
453731
413328
383025
70%
797979
747271
706663
656056
605450
564944
524440
484035
443631
403227
372924
Zonal Lumens Summary
Zonal Lumens Summary
Zone
Zone
0-30
0-40
0-60
0-90
90-180
0-180
Lumens%Lamp %Fixture
1295
2160
4145
4396
0
4396
22.3 29.5
37.2 49.1
71.5 94.3
75.8 100.0
0
0
75.8 100.0
0-30
0-40
0-60
0-90
90-180
0-180
50%
767676
706867
646159
585552
534946
484340
433936
393531
353127
322724
292421
Lumens%Lamp %Fixture
2092
3604
5649
5923
0
5923
24.0 35.3
41.4 60.9
64.9 95.4
68.1 100.0
0
0
68.1 100.0
PM3-20X4
FLUORESCENT: One Lithonia Way Conyers, GA 30012
Phone:770.922.9000
Fax: 770-918-1209 www.lithonia.com ©1997-2016 Acuity Brands Lighting, Inc. All rights reserved. Rev. 05/18/16