Delete Polygons facing and touching eachother

Ok, so with a little further experimentation. it seems that overlapping normals need to be 100% overlapping without a margin of error. when using the snap tool to snap cubes or other meshes next to each-other, there is a .00001 or something margin of error. causing facing objects not to delete faces.

To help speed work-flow even further.
I think that we need another script that should run before this one that acts sort of like a weld selected vertex in edit poly mode,
However having it just move near vertex together from 2 separate models without the weld.

yeah the objects need to be editable poly base-objects
and not attached

then just execute it (may have to switch to modify panel but shoundt have to theoretically)

One kick ass script indeed! Thanks man !
( not sure what the issue was ... but it works now)

doing that after the attaching would've been easier to code.. so i wrote one that would do it before you attached any

(
	struct faceData
	(
		public owner, public center, public area, public normal, public i;
	)
	
	-- collect all data for comparison
	local faceDataNArr = for o in geometry where classOf o == Editable_Poly collect 
	(
		for f = 1 to (polyop.getNumFaces o) collect
			faceData o (polyop.getFaceCenter o f) (polyop.getFaceArea o f) (polyop.getFaceNormal o f) f;
	)
	
	-- compare all faces and collect equal ones
	local equals = #()
	for x in faceDataNArr do
		for i in x do
			for y in faceDataNArr where (x != y) do
				for o in y do 
					if ((i.center == o.center AND i.area == o.area) AND i.normal == -o.normal) do (append equals o);
	
	-- sort them by owner(object)
	local sortedOwners = #();
	local sortedVals = #();
	for each in equals do
	(
		local found = findItem sortedOwners each.owner
		
		if (found != 0) then
		(
			sortedVals[found][each.i] = true;
		)
		else
		(
			append sortedOwners each.owner;
			append sortedVals #{each.i};
		)
	)

	-- now delete the equal ones
	for i = 1 to sortedOwners.count do
		polyop.deleteFaces sortedOwners[i] sortedVals[i];
	
	OK
)

Aww man, I couldn't get it to work.
What is the workflow for this script?
Can i just use standard cubes? or do they need to be editable poly/mesh?
(ive attempted all scenarios i could think of)

Does the script need to be installed somehow?
Right now i'm just doing the run script and or drag and drooping it into Max 2012 and 2013.