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FIRE/SMOKE DAMPER – MODEL 771 & 771-3 CLASS I 771 (1-1/2 HR.) RATED 771-3 (3 HR.) RATED


Download Product Catalogue for FIRE/SMOKE DAMPER – MODEL 771 & 771-3 CLASS I 771 (1-1/2 HR.) RATED 771-3 (3 HR.) RATED

Features – U.L. rated for static/dynamic closure & leakage CLASS I @ 350o F, for use in a 2 hour walls or floors in the HVAC systems with velocities to 2000 FPM and pressure to 4” W.G.  Meets NFPA 90A & UL555 & UL555S.

STANDARD CONSTRUCTION 

FRAME: 4-5/16” deep, 16 gauge galvanized steel

BLADES: 6” wide triple “V”, 16 gauge galvanized steel (Bottom blade width may vary depending on damper height)

BLADE AXLES & BEARINGS
AXLES – 7/16” Plated hex
BEARINGS – Bronze oil impregnated

LINKAGE: Plated steel in opposed blade configuration, concealed inside the jamb.Operator shaft is 1/2” steel rod extending 4-1/2” from damper side

SEALS: Extruded Silicone blade seals and stainless steel jamb seals

MAXIMUM UL CLASSIFIED LEAKAGE CLASS I SIZES
Single section assemblies:
771(36” x 48”)
771-3 (36” x 36”)

MULTIPLE ASSEMBLIES
Multiple assemblies: (made of sections no larger than above sizes)
771(144” x 48”) vertical or horizontal mount
771-3 (144” x 36” max.) vertical or horizontal mount
Available also in 144”w x 96”h (Static Rated)

MINIMUM UL CLASSIFIED LEAKAGE CLASS I SIZE
7718”W x 6”H
771-36”W x 6”H

SLEEVE: 18 ga. x 16” deep galvanized steelUNDERSIZED:  1/4” under ordered size unless specified Exact or Actual

FINISH: Galvanized

HEAT SENSOR: 165°F standard. 212°F, 250°F, or 350°F

OPERATOR: Refer to UL approved actuator chart (Specify external or internal mounting)

Dampers are part of fire prevention and protection structures placed within air conditioning and ventilation structures, by making use of fireproof walls.

We supply fire smoke damper in UAE and the GCC region, and these work much in the same way as a regular model, based on a fire resistance rating, and works to also prevent the spreading of smoke within a duct or vent.

When prompted by the abrupt elevation of heat levels, the fire damper shuts itself when sprung into action by an item that has a specific trigger point to sense fire. Springs are used to shut the blades of the device.

Apart from the use of heat to be triggered, fire dampers may also rely on an electrical trigger that often comes from a fire alarm infrastructure.

Although the building requirements in different countries will give rise to several design and construction types, the overall structure is based on sensing heat or smoke in inhabited parts of the building.

Air Smoke Fire Dampers

These devices are based on a 3 in 1 design, to bring the function of each device’s purpose within the same item.

The fire damper aspect prevents the ability to combust particles to transfer into other areas of the building.

The damper helps to regulate air in several areas, while the smoke damper restricts the spread or it moving away from the point of origin.

Motorized and Plain Fire Damper Mechanism

Fire Dampers restrict the flow of air throughout a floor or a house and prevent a fire from moving.

Motorized and other types both work to inhibit the movement of the flame, based on a fusible link, which closes up when it melts.

What sets the motorized variant apart is that it makes use of either electric or pneumatic actuators, which are influenced by an alarm or a detector, which senses smoke or heat.

This type of fire damper is used usually in places where there is a pressing need for smoke and fire both, to be inhibited.

Fire Smoke Damper Upkeep

Although the devices are the instrument of extraordinary and robust construction, often requiring very minimal maintenance, building control authorities and regulators often stipulate strict conditions for use and repairing schedules.

Over a period of time, fire dampers can become deficient, although this is quite rare. This involves the clearance surrounding the device being too high, thereby being incompatible with the certificate. This can also happen if it adjoins an entry point with other facets.

Regulatory requirements often need for fire and smoke dampers to be tested regularly, mostly after a period of every few years after the initial check following installation.

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