Changes the holo-fan to the holo-firelock, other minor changes and fixes

code/game/objects/effects/effect_system/effects_foam.dm

@@ -1,5 +1,9 @@
 // Foam
 // Similar to smoke, but slower and mobs absorb its reagent through their exposed skin.
+#define ALUMINUM_FOAM 1
+#define IRON_FOAM 2
+#define RESIN_FOAM 3
+
 
 /obj/effect/particle_effect/foam
 	name = "foam"
@@ -22,16 +26,16 @@
 
 /obj/effect/particle_effect/foam/metal
 	name = "aluminium foam"
-	metal = 1
+	metal = ALUMINUM_FOAM
 	icon_state = "mfoam"
 
 /obj/effect/particle_effect/foam/metal/iron
 	name = "iron foam"
-	metal = 2
+	metal = IRON_FOAM
 
 /obj/effect/particle_effect/foam/metal/resin
 	name = "resin foam"
-	metal = 3
+	metal = RESIN_FOAM
 
 
 /obj/effect/particle_effect/foam/New(loc)
@@ -48,12 +52,12 @@
 /obj/effect/particle_effect/foam/proc/kill_foam()
 	STOP_PROCESSING(SSfastprocess, src)
 	switch(metal)
-		if(1)
-			new /obj/structure/foamedmetal(src.loc)
-		if(2)
-			new /obj/structure/foamedmetal/iron(src.loc)
-		if(3)
-			new /obj/structure/foamedmetal/resin(src.loc)
+		if(ALUMINUM_FOAM)
+			new /obj/structure/foamedmetal(get_turf(src))
+		if(IRON_FOAM)
+			new /obj/structure/foamedmetal/iron(get_turf(src))
+		if(RESIN_FOAM)
+			new /obj/structure/foamedmetal/resin(get_turf(src))
 	flick("[icon_state]-disolve", src)
 	QDEL_IN(src, 5)
 
@@ -240,13 +244,15 @@
 /obj/structure/foamedmetal/resin
 	name = "ATMOS Resin"
 	desc = "A lightweight, transparent resin used to suffocate fires, scrub the air of toxins, and restore the air to a safe temperature"
-	opacity = 0
+	opacity = FALSE
 	icon_state = "atmos_resin"
 	alpha = 120
 	obj_integrity = 10
 	max_integrity = 10
+	layer = EDGED_TURF_LAYER
 
-/obj/structure/foamedmetal/resin/New()
+/obj/structure/foamedmetal/resin/Initialize()
+	. = ..()
 	if(isopenturf(loc))
 		var/turf/open/O = loc
 		if(O.air)
@@ -256,17 +262,21 @@
 				qdel(H)
 			var/list/G_gases = G.gases
 			for(var/I in G_gases)
-				if(I != "o2")
+				if(I != "o2" && I != "n2")
 					G.gases[I][MOLES] = 0
 			G.garbage_collect()
 			O.air_update_turf()
 		for(var/obj/machinery/atmospherics/components/unary/U in O)
-			if(!isnull(U.welded) && !U.welded) //must be an unwelded vent pump or vent scrubber.
-				U.welded = 1
+			if(!U.welded)
+				U.welded = TRUE
 				U.update_icon()
 				U.visible_message("<span class='danger'>[U] sealed shut!</span>")
 		for(var/mob/living/L in O)
 			L.ExtinguishMob()
 		for(var/obj/item/Item in O)
 			Item.extinguish()
-	..()
+
+
+#undef ALUMINUM_FOAM
+#undef IRON_FOAM
+#undef RESIN_FOAM