effectively causes the door to move from the first position 250 to the second position 252 as best shown in the front view of fig4 the hinge 246 can include one or more hinge mounting brackets e g a first hinge mounting bracket 258 and a second hinge mounting bracket 260 a hinge rod 262 also u201c axle 262 u201d extends between the hinge mounting brackets 258 260 this configuration of the hinge 246 provides at least one degree of freedom for the door component 202 to move e g between first position 250 and second position 252 of fig3 in one example the heating component 206 includes one or more heating elements e g a first heating element 264 that provide thermal energy about the periphery of the door component 202 and the closure assembly e g closure assembly 108 of fig1 examples of the heating element 264 include heating cables and or filaments that generate thermal energy in response to electrical stimulation fig5 and 6 provide side cross section views of respectively the top 242 fig5 and the bottom 244 fig6 of the door component 202 to illustrate one construction for the door assembly 200 in the example of fig5 the door assembly 200 has an angled portion 266 near the top 242 of the door component 202 the angled portion 266 extends from the wall 248 into the interior 254 of the ducting 230 the door assembly 200 also includes a bracket element 268 that also extends from the wall 248 proximate the angled portion 268 the position of the bracket element 268 with respect to the angled portion 266 can form a gap.