I have a small basement that I'm insulating with 2" extruded polystyrene insulation. There is a smaller 1" gap behind the heat/air unit which I'm putting 1" insulation in. I'm wondering if this will pose any problems when the heater (gas) is running. I don't want the insulation to heat up, melt, burn, etc.
Pictures of what I'm doing are attached.
Anyone know of any issues with what I'm attempting? If so, how can I unsulate this space safely?