what are the key points of fire acceptance of smoke control and extraction system in construction project? The following Zhongda Consulting Bidding Teacher will answer your questions for your reference.

1. Fan

1. Fan performance:

It is required that the famous brands and materials correspond to each other, and all of them have obvious signs for fire smoke exhaust, and all of them meet the design requirements of air volume, wind pressure and power.

it is often found that the smoke exhaust fan runs continuously for 31 minutes when it does not meet 281 degrees. Check whether the fan motor is effectively protected (the motor is not in direct contact with the ventilation medium).

2. Fan protection:

Outdoor fans should be installed on the roof, and indoor fans should be installed in the fan room. The original fire protection code allows it to be installed in indoor space, but it should be protected around.

3. Fan startup:

Check whether the installation position of the manual startup button is easy to find and operate, and it is clearly marked.

4. Installation of the fan:

Whether it is firmly fixed and whether there is great vibration during operation.

5. Whether the fan flexible joint meets the fire protection requirements.

2. Air duct

1. The smoke exhaust duct and positive pressure air supply duct installed in the ceiling shall be insulated.

2. The thickness of the iron sheet of the smoke control pipeline should meet the thickness of the high-pressure air duct, and the connection should adopt flange connection.

3. Fire damper

1. The name plate of the fire damper should be marked with the operating temperature, which is consistent with the design.

2. The installation position of the fire damper should be close to the protected object (no more than 211mm away from the firewall or fire partition wall)

3. Whether the pipelines on both sides of the firewall are reinforced when crossing the fire partition.

4. The opening state of the fire damper is consistent with the design.

5. The fire damper should have a separate hanger.

iv. smoke outlet

1. the type of smoke outlet should be consistent with the design. In addition to the common normally open tuyere for the smoke exhaust system responsible for a smoke prevention zone, the remotely controlled metal tuyere with remote+local control should be used for the smoke exhaust outlet.

2. The manual opening device should be installed in an obvious position with fire signs.

3. The actuator of the smoke outlet is installed in place and the effective air intake area of the smoke outlet meets the design requirements.

4. The installation position of the smoke outlet must be installed at a high place, at least not less than 1.8m from the ground.

5. check whether the setting and enclosure of smoke-proof zones meet the requirements, and whether the smoke outlet is installed in the corresponding smoke-proof zones and is consistent with the design position (the protection distance may be greater than 31m if the position changes).

V. Positive pressure air supply outlet

1. The type of air outlet should be consistent with the design. Except for the positive pressure air supply system within the second floor, the front room air supply system can use ordinary normally open tuyeres, and the rest should use remotely controlled metal tuyeres with remote+local control. Generally, the air supply in stairwells adopts the normally open tuyere such as the vertical tuyere.

2. Check that the opening state of the tuyere is consistent with the design (the remote control tuyere should be closed at ordinary times)

3. The actuator is installed in place without affecting the effective ventilation area of the tuyere.

4. check whether the manual opening device is in obvious position and convenient to open.

VI. Control and linkage

1. Manual button Whether the fan can be turned on manually. If there is an air supply system, whether to automatically start the air supply fan.

2. whether the fan can be started by manually opening any smoke outlet (or positive pressure air supply outlet).

3. Does the fire control room monitor the opening and closing status of fans and tuyeres?

4. Whether the installation location of the manual button is clearly marked in the environment and easy to open depends on whether you have a system label.

VII. Smoke exhaust and air supply system

1. Whether the smoke exhaust area is equipped with corresponding air supply measures according to the design requirements. If there is a natural air supply system, check whether there is an air supply channel. Whether the wind speed of outdoor air inlet of natural air supply exceeds the standard.

2. The makeup fan should be interlocked with the corresponding exhaust fan.

VIII. Others:

1. Check whether the switching device is in place for the smoke exhaust system which is also used for normal exhaust.

2。 Whether the air duct of ventilation and air conditioning system passes through the fire partition, the ventilation and air conditioning room and the partition walls and floors of important or high fire risk rooms are equipped with fire dampers. Whether the air ducts before and after the fire damper are reinforced and whether the thermal insulation material (insulation) is incombustible.

3. Whether the vertical exhaust pipes such as kitchen, bathroom and toilet are equipped with fire backflow prevention measures or fire dampers on the branch pipes.

4. The outdoor outlet of the smoke exhaust system should be far away from the outdoor air inlet of positive pressure air supply, and the distance between them should be at least 11 meters. When installed up and down, the smoke outlet should be installed at the upper part and not less than 3 meters higher than the outdoor suction port of the positive pressure fan.

5. A check valve should be set at the fan outlet of the mechanical pressurized air supply system.

6. Positive pressure air supply parts shall be provided with overpressure prevention measures. Generally, residual pressure valve or fan frequency conversion adjustment is adopted.

7. The soft joint connecting the smoke exhaust machine and the smoke exhaust pipeline adopts ordinary canvas.

8. The fire damper and smoke exhaust fire damper are not provided with independent supports and are subjected to fire prevention treatment.

9. There are holes in the brick shaft, and the inner surface is not leveled with mortar, and the bottom of the shaft is not sealed.

11. Pay attention to check the seal of the joint between the iron air duct and the civil air duct.

IX. Data check

1. Is there any design change when it is inconsistent with the design

2. Is there a certificate of approval for the fan and fire damper and technical data related to the product?

3. Whether the thermal insulation materials have the factory certificate and the permission procedures of the local competent department.

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