diff --git a/code/__HELPERS/unsorted.dm b/code/__HELPERS/unsorted.dm
index 564910d3df..6d61f7aa13 100644
--- a/code/__HELPERS/unsorted.dm
+++ b/code/__HELPERS/unsorted.dm
@@ -949,6 +949,8 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 	//       Movement based on lower left corner. Tiles that do not fit
 	//		 into the new area will not be moved.
 
+	// Does *not* affect gases etc; copied turfs will be changed via ChangeTurf, and the dir, icon, and icon_state copied. All other vars will remain default.
+
 	if(!A || !src) return 0
 
 	var/list/turfs_src = get_area_turfs(src.type)
@@ -1002,7 +1004,8 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 						if(istype(B, /turf/space))
 							continue moving
 
-					var/turf/X = new T.type(B)
+					var/turf/X = B
+					X.ChangeTurf(T.type)
 					X.set_dir(old_dir1)
 					X.icon_state = old_icon_state1
 					X.icon = old_icon1 //Shuttle floors are in shuttle.dmi while the defaults are floors.dmi
@@ -1042,12 +1045,6 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 					copiedobjs += newobjs
 					copiedobjs += newmobs
 
-
-
-					for(var/V in T.vars)
-						if(!(V in list("type","loc","locs","vars", "parent", "parent_type","verbs","ckey","key","x","y","z","contents", "luminosity")))
-							X.vars[V] = T.vars[V]
-
 //					var/area/AR = X.loc
 
 //					if(AR.lighting_use_dynamic)
@@ -1063,22 +1060,9 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 
 
 
-	var/list/doors = new/list()
-
 	if(toupdate.len)
 		for(var/turf/simulated/T1 in toupdate)
-			for(var/obj/machinery/door/D2 in T1)
-				doors += D2
-			/*if(T1.parent)
-				air_master.groups_to_rebuild += T1.parent
-			else
-				air_master.tiles_to_update += T1*/
-
-	for(var/obj/O in doors)
-		O:update_nearby_tiles(1)
-
-
-
+			air_master.mark_for_update(T1)
 
 	return copiedobjs