Final answer:
The question is about the maximum length of indoor gas hose connectors used for laboratory, shop, and ironing appliances or equipment.
Step-by-step explanation:
The subject of this question falls under the field of Engineering.
The specific topic is related to the use of indoor gas hose connectors in laboratories, shops, and when operating ironing appliances or equipment that require mobility.
The question seeks to determine the maximum length that the connector should not exceed.