Interpretation of the provisions of the fire protection code for fire protection buildings 3 7 5 on

"The minimum clear width of the outer door on the first floor is not less than this provision is a comprehensive consideration of the evacuation requirements of the factory building with 4 floors and below, plus the provisions of the article, that is: there are at least 2 or more doors on the first floor of the factory. As for the more doors to open, of course, more is also good!

In your case, if the doors corresponding to the 4 stairs are not smaller, the above requirements have been met.

In addition to several fixed indicators required by the mandatory requirements, the size of the building evacuation opening is mainly determined according to the number of personnel in the plant. i.e. tables.

If there are 1,000 employees in the 4th floor of the factory, the net width of the door should be 10m, and if it is divided into 4 doors, each door, then the first floor also needs a door. Of course, you can also set 5 or 6 or so on. You can also use a minimum of 9 doors and add some other doors.

The more doors, the better the evacuation effect. This size is not within the mandatory 10-metre door width.

Therefore, your new door belongs to the increase of exits, under the premise that the original door has met the strong bar, the size of your new door does not matter at all, and the general door will not be smaller.

The addition of fire partitions is conducive to fire protection, and there are exceptions to the rule of 2 doors per fire partition. You can see if you are satisfied. And under the premise that the 4 staircase doors meet the upper floor of the plant, the additional fireproof partition should be regarded as an independent partition, and the door width is calculated according to the number of people in the independent partition, if there is a 70 square area with 2 people working, open a door fully meets the evacuation requirements.

1. The safety exit of the single-storey plant should be changed to meters, including the direct external exit for personnel escape in the second question, which should be changed to meters. This is the original intention of the requirements of the specification, and the other layers can be required for meters because they are not directly external.

2. So these exports are calculated. If on the basis of meeting the calculation requirements, the width of the additional outlet can be considered not less than meters.

The first question is that you can not change it.

The second question is a bit special, I really can't think of what plant safety exit door or the bottom floor, this point needs to ask you, in terms of specifications, the first floor of the safety exit should not be, fire acceptance of the staircase spacing, safety exit, fire box, fire door and so on have special requirements.