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1. Fire resistance limit of air duct specified in Technical Standard for Building Smoke Control and Smoke Extraction System:

（1）排煙風管

(1) Smoke exhaust duct

（2）消防通風管道安裝加壓送風風管

(2) Installation of pressurized air supply duct for fire ventilation duct

（3）送風風管

(3) Air supply duct

2、《建筑設計防火規范》對風管耐火極限的規定：

2. Fire resistance limit of air duct specified in Code for Fire Protection Design of Buildings:

風管越過耐火極限、樓板和防火墻時，穿越處風管里的排煙防火閥、防火閥兩邊各2.0m范圍里的風管應采用防火風管或風管表面應采用防火保障措施，且耐火極限不可小于該防火分隔體的耐火極限。

When the air duct crosses the fire resistance limit, floor slab and firewall, the smoke exhaust fire damper in the air duct at the crossing and the air duct within 2.0m on both sides of the fire damper shall adopt fire resistant air duct or the air duct surface shall adopt fire protection measures, and the fire resistance limit shall not be less than the fire resistance limit of the fire compartment.

（一般狀況，耐火極限耐火極限2.0h；樓板耐火極限1.5h；防火墻耐火極限3.0h。）

(In general, the fire endurance is 2.0h; the fire endurance of floor slab is 1.5h; the fire endurance of firewall is 3.0h.)

3、《建筑防煙排煙系統技術標準》對風管隔熱的規定：

3. The Technical Standard for Building Smoke Control and Smoke Exhaust System specifies the thermal insulation of air duct:

當吊頂內有可燃物時，吊頂里的排煙管道應選用不燃材料開展隔熱，并應與可燃物維持不小于150mm的間距。

When there are combustibles in the ceiling, the smoke exhaust pipe in the ceiling shall be insulated with incombustible materials, and the distance between the pipe and the combustibles shall not be less than 150mm.

注：排煙風管設定隔熱的目的是避免高溫煙塵點燃吊頂里的可燃物。車庫無吊頂，且都是機電管道，無可燃物，從隔熱規定來看，車庫排煙風管無需設定隔熱對策。當吊頂內無可燃物時，也無需設定隔熱對策。

Note: The purpose of setting thermal insulation for smoke exhaust duct is to prevent high-temperature smoke and dust from igniting combustibles in the ceiling. The garage has no suspended ceiling, and is all mechanical and electrical pipes, free of combustibles. From the perspective of thermal insulation regulations, the garage smoke exhaust duct does not need to set thermal insulation measures. When there are no combustibles in the ceiling, there is no need to set thermal insulation measures.

螺旋通風管道廠家隔熱和耐火極限是兩個不同的概念！

Thermal insulation and fire resistance limit of spiral ventilation duct are two different concepts!

4、耐火極限定義

4. Definition of fire endurance

在規范防火試驗條件下，建筑構件、配件或構造從受到火的作用時起，至喪失承載力、完整性或隔熱性時止常用的時間，用小時表示。

Under the specified fire test conditions, the common time from the time when building components, fittings or structures are exposed to fire to the time when they lose their bearing capacity, integrity or thermal insulation is expressed in hours.

通風管道加工安裝的耐火極限包含風管的防火完整性和風管的防火隔熱性，二者必須同時滿足。與結構梁、柱子、承重梁不同的是，風管無需滿足防火承載力。

The fire endurance of the processing and installation of the ventilation duct includes the fire integrity of the air duct and the fire insulation of the air duct, both of which must be met at the same time. Unlike structural beams, columns and load-bearing beams, air ducts do not need to meet the fire resistance bearing capacity.

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