Hi shaun no melted plastic as the hot air vent is outside of the box and the exhaust is insulated.
Geoff
It is actually quite a good peice of kit, around £800 - £900 pounds new! A lot of cleaners use these and they are very reliable, I used to fit them into fishing boats and motor cruisers in mypast life as a marine engineer and they go on for years. don't have facilities to park van outside of house at night so cannot use mains heater and if you are talking about those little parafin heaters, they produce a lot of condensation so no thanks. And as to your comment saying can't see anybody wanting one, well i'm not offering anybody one! simply showing what i have made to possibly give others ideas.
Cheers Goron