Answer

From a Jain Dharma perspective, the sin is minimized by switching the fan off when you leave, even if you are coming back in 15 minutes.

Explanation

In Jain ethics, we try to reduce:

• Unnecessary use of resources
• Carelessness
• Possible harm to living beings
• Attachment to comfort

If the fan is kept running while no one is using it, it becomes unnecessary activity. A moving fan may also harm very small flying insects if they come near it. So, when you are not in the room, switching it off is generally the more careful and restrained choice.

Spiritual Understanding

Jain Dharma teaches apramatta bhav — living with awareness and carefulness. The point is not to feel fear or guilt over every small action, but to reduce avoidable harm wherever possible.

So the better thought is:

• “I am leaving the room.”
• “The fan is not needed right now.”
• “I will switch it off and turn it on again when I return.”

Takeaway

If you are leaving for around 15 minutes, switch off the fan. This reflects Jain values of carefulness, non-violence, and limiting unnecessary consumption.