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VEE-GROOVE BLADE FIRE DAMPERS
MULTI-BLADE FIRE DAMPERS
MODELS: D1250/D1251/D1252/D1253
HOW TO ORDER:
Select model number and size, then select from each variable as applicable. Choose accessories as desired.
See previous page for description of variables and accessories.
E
D1250
ie: 36" x 24"
D1251
or
D1252
18" dia.
D1253
Notes:
1. * Standard sleeve is 16" (406) long (suitable for 4" (102) thick wall) x 20 ga. (1.0).
SUGGESTED SPECIFICATION:
Provide and install, as shown on plans and/or schedules, multi-blade Dynamic Fire Dampers, as manufactured by Nailor
Industries, meeting or exceeding the following criteria: Frame shall be constructed of 16 ga. (1.6) galvanized steel hat channel
with mitered corners reinforced with die-formed corner gussets for strength. Blades shall be of vee-groove design 16 ga. (1.6)
galvanized steel on 5 1/2" (140) centers and shall be parallel configuration. Blade axles shall be 1/2" (13) dia. plated steel,
double bolted at each end of blade to ensure positive locking connection. Hex or square friction-fit, or press-fit axles are not
acceptable. Bearings shall be self-lubricating oilite bronze type. Blade linkage shall be zero-maintenance, concealed in frame,
out of airstream.
Fire dampers shall meet the requirements of NFPA 90A and shall be manufactured, tested and labeled in accordance with UL
555 Safety Standard for Fire Dampers – Sixth Edition, June 1999, including Dynamic Closure Test. Dampers shall be classified
for dynamic closure against an airflow velocity of 2000 fpm (10.16 m/s) or 3000 fpm (15.24 m/s) (specifier select one) at 4"
w.g. (1 kPa) static pressure differential (across closed damper).
Each fire damper shall bear a UL 1 1/2 hour fire resistance rating label, in addition to label verifying the airflow and closure
pressure ratings as established by the Dynamic Closure Test. Each fire damper shall also be marked with the words "For use
in dynamic systems". Dampers marked "For use in static systems only" are not acceptable.
Each fire damper shall be complete with a (specifier select one) 165°F (74°C) or 212°F (100°C) UL Listed fusible link that
will cause the damper to close and lock in closed position by means of an over-center/knee lock linkage for assured closure.
Fire dampers shall each include a steel sleeve of appropriate length/gauge as field verified by contractor, and retaining angles,
supplied by damper manufacturer to ensure proper installation in accordance with damper manufacturer's instructions. Each
damper shall be supplied with an internal manual quadrant(s) for setting and locking of blades in desired position. Contractor
shall provide and install an access door at each fire damper, of appropriate size to allow for inspection, testing and fusible link
replacement. Information submitted for approval shall include independent pressure drop data and confirmation of UL
qualifications in addition to manufacturer's installation instructions. Each shipment of fire dampers shall include same
installation instructions. Standard of acceptance: Nailor Industries Model Series D1250.
Previous View
E20
E20
HOW TO SPECIFY OR TO ORDER
V
24
FL
165
H
34
212
Home
Contents
20G
CR
L8
NONE NONE
18G
CO
L0
JSM
16G
CSR
14G
10G
Dimensions
Performance
300D
BPV
SMP
QS1
QS2
TDF1
TDF2
Specification Text File
Specification
Revised September 23, 2004
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