Air duct mounting

• Correct air duct connection is of significant importance to ensure reliable operation and aerodynamic characteristics of mounted air ducts.
• Flexible air ducts are connected to basic ventilation system components by various fittings or connected directly to final components as ventilation grilles, disk valves and fans.
• A wide range of VENTS fittings is designed to consider variety of manifold air duct connections and facilitate mounting works a lot.

• Construction meter
• Marker
• Cutting knife
• Flat-nose pliers or cutting pliers
• Gloves (for work with insulated air ducts)
• Cross-point screwdriver for clamp fixing
• Mounting tape
• Fixing clamps

• Mounted air duct must be stretched to the maximum to avoid pressure loss
• Air duct must not be deflected and sagged.
• Keep bend radius as large as possible because the minimum air bend increases pressure drop. To level up this effect the bend radius must be equal to the double air duct diameter.
• Provide grounding during mounting operations as static electricity can be accumulated during transportation of air containing organic solvents along the air ducts.
• Air flow in the air duct must have spiral motion.
• Use metal connectors or reducers in case of layout through wall constructions.
• Take precautions not to deform or damage air duct during mounting.

Warning! To avoid deformation stretch Aluvent air ducts gradually from the middle to the ends.

• Calculate the air duct length in such a way as to omit any sagging as mounted.
• Stretch the air duct to its maximum.
• Measure the required length and mark it.
• For non-insulated air ducts: cut air duct along a spiral turn with a sharp knife or scissors and cut the wire with cutting pliers.
• For insulated air ducts: first cut the outer sleeve with scissors. Use gloves for that.

• Connect the air duct to a fitting by spiral turns, the branch pipe length for connection to the air duct must be at least 50 mm. Seal the joint with a mounting tape if required.
• Fix it with a fixing clamp.

• Connect the air duct to the ventilation grille flange or fan branch pipe with respect to the spiral air motion.
• Fix it with clamps. Use respective diameter clamps. Make sure that the air duct is not deformed in the attaching points.

• Cover the branch pipe with the air duct at least by 50 mm by spiral turnings over the air duct. Seal the joint with a mounting tape if required.
• Fix the air duct with a fixing clamp.

1. Cover the branch pipe with the air duct at least by 50 mm by spiral turnings over the air duct.
2. Pull off the insulation material. Seal the joint with a mounting tape if required.
3. Fix the air duct with a fixing clamp.
4. Pull away the insulation material.
5. Fix the outer shell with a mounting tape by wrapping it twice around the air duct.

• Flexible air ducts are not recommended for use in vertical shafts above 2 floors high.
• In case of application of the flexible air duct in high temperature operating conditions make sure that the air duct temperature resistance is suitable for the specific operating conditions.
• During installation in fireproof constructions of the floors/ceilings the air ducts must comply with fire safety requirements.
• Flexible air ducts are not suitable for routing through the floor or below ground. Contact with ground is not allowed.
• Use only specially designed air ducts for external mounting.
• Air ducts must be mounted far away enough from the places with excessive heat generation.
• Application scope of flexible air ducts can be limited by national norms and standards. Read information on air duct application and technical data before using the air ducts!

• Maximum sagging of the air duct between two suspension points must not exceed 50 mm/m (fig. 1 a).
• Distance between two suspension points ranges between 1.5 to 3 m depending on the air duct type (fig. 1 b).
• Effective span distance for the flexible air duct must be 1 meter (fig. 1 b).
• In case of vertical air duct layout the distance between the fixing clamps shall be from 1 m to 1.8 m (fig. 1 d).

GENERAL INFORMATION ON AIR DUCTS

AIR DUCT DESIGN

AIR DUCT CHARACTERISTICS