I. Core Principle: Understand the function of the fire damper

First of all, it is necessary to understand why to install:

Smoke isolation and fire prevention: During a fire, high temperatures or smoke detection signals close the valve, blocking the spread of fire and smoke through the air duct.

Ensure evacuation time: Provide precious time for personnel evacuation and fire fighting.

Maintain positive pressure: In smoke-proof stairwells, anterooms and other areas, fire dampers can ensure the effective operation of the positive pressure air supply system.

Ii. Preparatory Work Before Installation (The Foundation for Its Effectiveness

Carry out construction strictly in accordance with the design:

The installation location, model and specification must fully comply with the fire protection design drawings and standards (such as "Code for Fire Protection Design of Buildings" GB50016, "Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Works" GB50243).

Do not change the position or model by yourself.

Check the product quality

Inspection report: Check whether the product has a type inspection qualification report issued by the National Fire Product Quality Supervision and Inspection Center. This is the bottom line of compliance.

Visual inspection: The valve body should be intact, metal parts free from rust, and the actuator should operate flexibly.

Nameplate information: Check whether the nominal size, fire resistance limit (usually 1.5 hours or 3 hours), operating temperature (usually 70℃) and other information are consistent with the design requirements.

Check the installation conditions

The dimensions of the reserved openings for walls or floor slabs should be accurate, and preparations for fireproof sealing should be made.

The flange for the connection of the air duct should be flat and the bolt holes aligned.

Iii. Key Installation Steps and Technical Requirements (Key Points of Play)

The installation location is of vital importance

When air ducts pass through fire compartments such as firewalls and floor slabs, fire dampers must be installed. This is the most common and important location.

When passing through important computer room partition walls: such as when passing through the partition walls of ventilation and air conditioning computer rooms.

When passing through the partition walls of rooms with a high risk of fire: such as when passing through the partition walls of warehouses for flammable and explosive materials or important archives.

The horizontal pipe sections at the junctions of vertical air ducts and horizontal air ducts on each floor.

When air ducts pass through building deformation joints, fire dampers should be installed on both sides.

Independent hangers and supports

It is strictly prohibited to directly bear the weight of the fire damper by the air duct!

Independent supports and hangers must be set up on both sides of the fire damper to ensure that the fire damper can remain in its position and close normally after the air duct deforms or is burned in case of fire. This is the most easily overlooked yet extremely crucial point.

Valve body direction and airflow direction:

Check the airflow direction arrow on the valve body to ensure it is consistent with the actual airflow direction inside the air duct. Installing it in reverse will cause the valve to fail to close properly or affect the air volume.

Distance from firewalls and floor slabs:

Fire dampers should be installed closely against firewalls or floor slabs.

The air duct section between the valve body and the wall or plate should be made of steel plate with a thickness of ≥1.6mm, and the inner and outer surfaces of this section of the air duct as well as the insulation material should all be made of non-combustible materials.

After installation, the gap between the valve body and the wall or plate must be tightly filled with cement mortar or non-combustible materials for fireproof sealing.

The location of the executive body

When installing, ensure that the fusible element (temperature sensing element) faces the side with a higher risk of fire.

The actuator (on the side of the operating handle) should reserve maintenance space (usually no less than 250mm) to facilitate manual reset and daily inspection. Do not embed it in the wall or decorative layer.

Electrical connection and interlocking

For fire dampers controlled by electric or electrical signals, the wiring must be accurate and secure.

After installation is completed, a functional linkage test must be conducted with the automatic fire alarm system (FAS) to ensure that the fire alarm signal can remotely close the fire damper and feed back the valve closing signal to the fire control room.

Iv. Commissioning and Acceptance after Installation

Manual testing: After installation is completed, manually operate the actuator to check whether the valve opens and closes flexibly and smoothly, and whether there is any jamming. After closing, check if the seal is tight.

Interlocking test: Cooperate with the fire protection system integrator to simulate fire alarm signals and test whether the automatic closing function and signal feedback function of the fire damper are normal.

Archiving of materials: Organize and file the product qualification certificates, inspection reports, installation and commissioning records, etc., as necessary documents for the completion acceptance.

V. Regular Maintenance and Upkeep (Guarantee for Continuous Effectiveness

No matter how good the installation is, it cannot do without daily maintenance.

Regular inspection: Inspect once every six months or once a year to remove dust and oil stains inside the valve body.

Action test: Regularly conduct manual and automatic shutdown tests to ensure that the mechanism is not rusted or jammed.

Fusible sheet inspection: Check whether the fusible sheet is intact, without any detachment or damage. Replace it according to the original specification if necessary.

Electrical inspection: Check whether the terminal blocks and signal feedback devices are working properly.