The length of the heat discharge pipe can be extended to a maximum of 1.5m. The diameter of the pipe is approximately 14cm (outer diameter).The BLU09 heat discharge pipe is highly durable, designed to minimize heat gain for optimal performance with your BLU09 portable air conditioner. Please note this heat discharge pipe is only suitable for use with the BLU09 portable air conditioner. We cannot advise if it will be suitable for use with 'other' models.