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VEE-GROOVE BLADE FIRE DAMPERS
• VEE-GROOVE BLADE
• UL 555 CLASSIFIED
DYNAMIC FIRE DAMPER
• 1 1/2 HOUR LABEL
MODELS:
D1250 TYPE A
D1251 TYPE A IN SLEEVE
D1252 TYPE B
D1253 TYPE C
The Nailor Series D1250 multi-blade fire damper, with sturdy vee-groove style blades and rugged mitered corner hat channel frame
design that virtually eliminates racking, provides 1 1/2 hour UL labeled fire protection suitable for use where ductwork penetrates
a wall or floor with a fire resistance rating of up to 2 hours. The over-center/knee lock with high torque spring fusible link assures
fail-safe closure during fire conditions. The D1250 series is also approved for use in static or dynamic HVAC system designs.
Available with factory fitted sleeve Model D1251, and choice of transition styles, the D1250 Series is supplied as standard with an
internal hand locking quadrant, and is a versatile and economical performer suitable for use in the majority of today's applications.
QUALIFICATIONS:
• UL 555 CLASSIFIED DYNAMIC FIRE DAMPER • 1 1/2 hr. Label.
(File # R9492).
• CAN/ULC-S112 CLASSIFIED FIRE DAMPER (File # R19569).
• California State Fire Marshal: Fire Damper Listing No. 3225-0935:101
• City of New York Board of Standards and Appeals. Cal. No.
460-88-SA.
• Meets NFPA 80, 90A and 101 as well as IBC and NBC (Canada)
and associated building code requirements.
• Maximum velocity 2000 fpm @ 4" w.g. (10 m/s @ 1 kPa) (up to
3000 fpm with size limitations).
CONSTRUCTION DETAILS:
FRAME:
5" x 7/8" x 16 ga. (127 x 22 x 1.6) galvanized
steel hat channel.
BLADES:
6" (152) wide on 5 1/2" (140) centers. 16 ga. (1.6)
galv. steel vee-groove design. Parallel action.
LINKAGE:
Concealed in frame. 12 ga. (2.7) plated steel.
BEARINGS:
1/ 2" (13) dia. self-lubricating oilite bronze.
AXLES:
1/2" (13) dia. plated steel double bolted to blades.
JACKSHAFT:
1/2" (13) dia. cadmium plated steel.
Internal locking quadrant is factory installed.
FUSIBLE LINK:
165°F (74°C) standard. 212°F (100°C) available.
MINIMUM SIZE:
Vertical or Horizontal mount: 8" x 8" (203 x 203).
MAXIMUM SIZE:
Single Section
Vertical mount:
Horizontal mount:
Multiple Section Assembly
Vertical mount:
Horizontal mount:
Previous View
Revised April 15, 2005
36" x 48" (914 x 1219).
30" x 40" (762 x 1016).
72" x 48" (1829 x 1219) or
36" x 96" (914 x 2438).
60" x 40" (1524 x 1016) or
30" x 80" (762 x 2032).
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Contents
Model D1250
TYPE A: MODEL D1250
CCW
TO
OPEN
DAMPER
SLEEVE
8" (203)
5" (127)
16" (406) STANDARD
TYPE A WITH SLEEVE: MODEL D1251
Standard factory sleeve (caulked to UL requirements) 16" long x 20 ga.
(406 x 1.0). Available up to 36" (914) dependent upon wall thickness.
Dimensions
Performance
1 3/4" (44) MAX.
Minimum
Wall
Sleeve
Thickness
Length
4 (102)
16 (406)
8 (203)
20 (508)
12 (305)
24 (610)
16 (406)
28 (711)
Specification
E17
E
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