Three-quarter view of an aluminum backdraft damper with gravity blades

Sistem Pengedaran Udara Bilik Bersih

Damper draf belakang

A gravity-closing blade assembly that opens with forward fan pressure and closes when airflow stops to limit reverse movement through the duct.

Automatic Gravity Closure
Low-Mass Aluminum Blades
Adjustable Start-Open Balance
Forward-Flow Only Protection

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Pengenalan Produk

The backdraft damper is a vertically mounted rectangular frame containing horizontally pivoted aluminum blades. Forward differential pressure lifts the blades open; when the fan stops or pressure reverses, gravity returns them to the closed position. Offset pivots and optional counterweights allow the start-open pressure to be adjusted without a motor. Blade-edge and jamb seals reduce reverse leakage, while external counterweight arms remain accessible for final balancing after installation.

Ciri-ciri Utama

Lightweight extruded blades respond to low forward pressure without an external power supply.

Gravity-assisted closure blocks reverse flow when the connected fan is idle or wind pressure changes direction.

Adjustable counterweights tune the opening threshold for the installed airflow and blade orientation.

Drainable frame profiles and corrosion-resistant aluminum suit intake, exhaust and weather-exposed openings.

Kebimbangan Produk Pelanggan

A backdraft damper must open at the available fan pressure, close reliably at zero flow and remain stable rather than fluttering in a turbulent opening.

Heavy blades consume too much fan pressure before the damper begins to open.Low-mass aluminum blades and an adjustable counterbalance reduce the required start-open differential.

Wind drives outdoor air backward through an idle exhaust branch.Gravity closure and blade-edge seals oppose reverse pressure when forward airflow disappears.

Turbulent fan discharge causes the blades to chatter against their stops.Adequate separation from the fan, balanced blade mass and optional damping weights stabilize movement.

A horizontal installation prevents gravity from returning the blades correctly.The damper orientation and airflow direction are selected so blade weight acts toward the specified closed position.

Permohonan yang biasa

Cleanroom exhaust fan outletsOutside-air intake isolationRelief-air discharge openingsRoof and sidewall fan connectionsStandby fan backflow prevention

Parameter teknikal

Typical construction ranges for a vertical-mount aluminum backdraft damper are listed below.

Bahan Teras	Extruded aluminum gravity blades with aluminum frame, stainless pivots and optional elastomer seals
Ketebalan Panel	1.0–1.5 mm hollow or formed aluminum blade wall
Lebar berkesan	150–1200 mm nominal clear opening width
Panjang maksimum	Up to 1500 mm nominal frame height
Keluli Menghadapi Ketebalan	1.0–1.5 mm galvanized linkage and counterweight support plates
Ketumpatan teras	Approximately 2700 kg/m³ for the aluminum blades and frame
Kekonduksian Terma	Approximately 160–205 W/(m·K) for aluminum airflow components
Kemasan permukaan	Natural mill-finish aluminum or clear anodized and powder-coated construction
Jenis Bersatu	Flanged rectangular frame with independently pivoted gravity blades and adjustable external counterweights
Penyesuaian	Boleh didapati berdasarkan aplikasi yang dimaksudkan dan persekitaran operasi.

Pilihan yang boleh didapati

Blade and jamb sealsAdjustable counterbalance weightsBird screen or weather louver combinationAluminum, galvanized or stainless-steel construction

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