![What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a](https://preview.redd.it/vjczk6zjg4l71.jpg?width=640&crop=smart&auto=webp&s=9e52ad964ce29fca77664e3af80a440c5e90e41e)
What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a
![What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a](https://preview.redd.it/h16sc6zjg4l71.jpg?width=640&crop=smart&auto=webp&s=20257d8e671b68afcf91d9772b68d8eb5cb6f6b7)
What would be the best way to fill this old boiler flue hole? I Really hate this make shift covering the old house owner had covering it. Wall looks to be a
![Do we need to seal gas boiler flues, How to correctly seal gas boiler flues, gas safe TB 152 - YouTube Do we need to seal gas boiler flues, How to correctly seal gas boiler flues, gas safe TB 152 - YouTube](https://i.ytimg.com/vi/mf-IMG8a9qc/hqdefault.jpg)