GB4-EC, GB4-QREC
1
⁄
2
" Orifice
Adjustable
Concealed
Ceiling
Sprinkler
Manufactured by: Central Sprinkler Company
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
Product
Description
Royal Flush™
Concealed
Standard Response (GB4-EC)
Quick Response (GB4-QREC)
Extended Coverage Automatic Sprinklers
No. 3-10.6
Flush™ Adjustable Concealed
Sprinkler to seat flush with ceilings
that can fluctuate nearly
1
⁄
2
" in height.
It’s 3
1
⁄
4
" diameter cover plate presents
an unobstructed and aesthetically
pleasing appearance. The thin cover
plate projects a mere
3
⁄
16
" below the
ceiling.
The operating mechanism consists
of a liquid-filled 3mm or 5mm fran-
gible capsule that is only 2.0 cm in
length.
Operation: The Central Royal
Flush™ Adjustable Concealed
Sprinkler absorbs heat through the
ceiling cover plate which is soldered
to the adjustable retainer ring with a
fusible alloy. At the rated tempera-
ture, the alloy fuses, resulting in the
plate dropping away from the sprin-
kler. At this point, the deflector drops
down below the ceiling surface,
bringing about the glass bulbs
exposure to the fires heat. The heat
bursts the bulb resulting in a rapid
expulsion of the sealing cap. Water
can now flow in a pattern engineered
to meet the coverage requirements.
The Central GB4-EC and GB4-QREC
Royal Flush™ Adjustable Concealed
Extended Coverage Sprinklers cover
extended coverage areas with either
Quick Response or Standard
Response sensitivity. The GB4-EC
covers up to 18' x 18' with a 5mm bulb
providing standard response
sensitivity and the GB4-QREC covers
up to 18' x 18' with quick response
sensitivity using a 3mm bulb.
These sprinklers provide an
advantage in centerline of tile projects
as they allow greater spacing than the
15'-0" standard sprinklers allow. The
GB4-EC and GB4-QREC allow a 16'-
0" and 18'-0" maximum spacing. The
16'-0" maximum is optimum for ceiling
tile in the 4'-0" direction. This allows
design flexibility and a more cost
effective installation.
By adding the option of the clean
room seal, the GB4-EC can be used
in areas where dust or air flow cannot
be allowed between the room and the
area above the ceiling. This option is
used extensively in “clean room”
applications where the integrity of the
ceiling is critical. The Clean Room
Seal is U.L. Listed for 16'x16' and
18'x18' spacings for GB4-EC as
standard response only. It is NOT
Listed for the GB4-QREC.
See the
clean room seal data sheet for details.
Inherent in the design is the capability
to compensate for ceiling heights
which vary with respect to the sprin-
kler system drops. This significant
feature allows the Central Royal
2-96
Approvals: U.L., cUL,
MEA 64-93-E Vol. II
Temperature Ratings:
155
°
F/68
°
C Sprinkler with
135
°
F/57
°
C Cover Plate
200
°
F/93.3
°
C Sprinkler with
165
°
F/74
°
C Cover Plate
Maximum Working Pressure: 175 psi
Factory Hydro Test: 100% at 500 psi
Standard Finishes:
Sprinkler: brass
Cover Plate: brass, chrome plated,
white painted or custom
painted
Length: 2
1
⁄
2
" to 3"
(6.35 cm to 7.62 cm)
Cover Plate: 3
1
⁄
4
" diameter
(8.25 cm)
Ceiling Opening: 2
1
⁄
2
"
±
1
⁄
8
" diameter
(6.35 cm)
Adjustability:
1
⁄
2
"
(1.27 cm)
Weight: 6.6 oz.
(187 grams)
with ceiling
plate assembly
Patents: Patent #4,014,388 other
patents are pending.
Model: GB4-EC, GB4-QREC
Style: Concealed (adjustable)
Options: *Clean Room Seal
(Part #10908100)
* Clean Room Seal is U.L. Listed for GB4-EC as
standard response only. It is not Approved for GB4-
QREC. Please reference Clean Room Seal data
sheet for more information.
Wrench: GB4 (Part #1075)
Orifice Size:
1
⁄
2
"
K-Factor: 5.6
Thread Size:
1
⁄
2
" N.P.T.
Technical
Data
OBSOLETE
