1、《建筑防烟排烟系统技术标准》对风管耐火极限的规定：
1. Fire resistance limit of air duct specified in Technical Standard for Building Smoke Control and Smoke Extraction System:
（1）排烟风管
(1) Smoke exhaust duct
（2）消防通风管道安装加压送风风管
(2) Installation of pressurized air supply duct for fire ventilation duct
（3）送风风管
(3) Air supply duct
2、《建筑设计防火规范》对风管耐火极限的规定：
2. Fire resistance limit of air duct specified in Code for Fire Protection Design of Buildings:
风管越过耐火极限、楼板和防火墙时，穿越处风管里的排烟防火阀、防火阀两边各2.0m范围里的风管应采用防火风管或风管表面应采用防火保障措施，且耐火极限不可小于该防火分隔体的耐火极限。
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.
（一般状况，耐火极限耐火极限2.0h；楼板耐火极限1.5h；防火墙耐火极限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、《建筑防烟排烟系统技术标准》对风管隔热的规定：
3. The Technical Standard for Building Smoke Control and Smoke Exhaust System specifies the thermal insulation of air duct:
当吊顶内有可燃物时，吊顶里的排烟管道应选用不燃材料开展隔热，并应与可燃物维持不小于150mm的间距。
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：排烟风管设定隔热的目的是避免高温烟尘点燃吊顶里的可燃物。车库无吊顶，且都是机电管道，无可燃物，从隔热规定来看，车库排烟风管无需设定隔热对策。当吊顶内无可燃物时，也无需设定隔热对策。
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.
螺旋通风管道厂家隔热和耐火极限是两个不同的概念！
Thermal insulation and fire resistance limit of spiral ventilation duct are two different concepts!
4、耐火极限定义
4. Definition of fire endurance
在规范防火试验条件下，建筑构件、配件或构造从受到火的作用时起，至丧失承载力、完整性或隔热性时止常用的时间，用小时表示。
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.
通风管道加工安装的耐火极限包含风管的防火完整性和风管的防火隔热性，二者必须同时满足。与结构梁、柱子、承重梁不同的是，风管无需满足防火承载力。
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.
The above is a detailed introduction to the ventilation pipes in Jinan. I hope it will be helpful to you. If you have any questions, please contact us. We will provide services for you with our attitude http://www.jntfgd.com
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