In the field of environmental protection fire protection, stainless steel ventilation pipes need to meet the following standards:

- Material standards: Stainless steel ventilation pipes are usually made of 304, 316L and other stainless steel materials, which need to meet the relevant national standards or industry standards to ensure their corrosion resistance, high temperature resistance and strength.

- Size standard: The size of the stainless steel ventilation pipe needs to meet the design requirements, including pipe diameter, wall thickness, length, etc. The selection of pipe diameter and wall thickness needs to consider factors such as air volume, pressure and operating environment of the ventilation system.

- Connection standards: stainless steel ventilation pipes are usually connected by welding, flange connection, threaded connection, etc., and the connection mode needs to meet the relevant standards and specifications to ensure the tightness and reliability of the connection.

- Fire protection standards: In the field of environmental protection fire protection, stainless steel ventilation pipes need to have certain fire performance. Generally, the fire resistance limit of stainless steel ventilation pipes is not less than 1 hour, and the normal operation of the ventilation system can be maintained in the event of a fire.

- Leakage standard: stainless steel ventilation pipes need to have good sealing performance to prevent gas leakage. Generally, the leakage rate of stainless steel ventilation ducts is not more than 1%.

- Installation standards: The installation of stainless steel ventilation pipes needs to comply with relevant standards and specifications, including pipe support, hangers, slope, etc. Pay attention to the cleaning and protection of pipelines during installation to avoid contamination or damage to pipelines.

In short, in the field of environmental protection fire protection, stainless steel ventilation pipes need to meet a series of standards and specifications to ensure their safe and reliable operation.