Defrosting roll-up climate controlled door

A side frame of a roll-up door assembly, the side frame comprising:

• (a) an elongated structure defining a hollow interior, wherein the elongated structure comprises:
• (i) a wall mounting surface configured to be attached to a wall, wherein the wall mounting surface extends laterally between an interior end and an exterior end,
• (ii) a first lateral surface extending away from the interior end of the wall mounting surface, and
• (iii) a second lateral surface extending away from the exterior end of the wall mounting surface,
• (b) a first curtain track associated with the first lateral surface, wherein the first curtain track is configured to slidably receive a first curtain of the roll-up door assembly;
• (c) a second curtain track associated with the first lateral surface, wherein the second curtain track is configured to slidably receive a second curtain of the roll-up door assembly, wherein the first curtain track is interposed between the second curtain track and the wall mounting surface;
• (d) an outlet located on the first lateral surface and interposed between the first curtain track and the second curtain track;
• (e) a first inlet located on the first lateral surface and interposed between the first curtain track and the wall mounting surface, wherein the first inlet is configured to provide fluid communication between a first external environment directly adjacent to the first inlet and the hollow interior when the side frame extends from the wall into a high temperature space;
• (f) a first damper configured to control fluid communication between the first external environment and the first inlet;
• (g) a second inlet, wherein the second inlet is configured to provide fluid communication between a second external environment located directly adjacent to the second inlet and the hollow interior when the side frame extends from the wall into a low temperature space;
• and
• (h) a second damper configured to control fluid communication between the second external environment and the second inlet.

A door assembly interposed between a high temperature space and a lower temperature space, the door assembly comprising:

• (a) a first curtain;
• (b) a second curtain, wherein the first curtain and the second curtain at least partially define an internal volume in a lowered position;
• and
• (c) a side frame, wherein the side frame comprises:
• (i) an elongated body defining a hollow interior,
• (ii) a heater configured to circulate heated air into the internal volume, and
• (iii) at least one inlet assembly configured to provide fluid communication between the heater and the low temperature space such that the heater circulates air from the low temperature space into the internal volume.