Allow you to construct and deconstruct fire extinguisher cabinet. Also minor refactor. (Credit to Tigercat2000)

code/game/objects/items/devices/radio/intercom.dm

@@ -45,15 +45,16 @@
 	name = "station intercom (Security)"
 	frequency = SEC_I_FREQ
 
-/obj/item/radio/intercom/New(turf/loc, var/ndir = 0, var/building = 3)
+/obj/item/radio/intercom/New(turf/loc, ndir, building = 3)
 	..()
 	buildstage = building
 	if(buildstage)
 		processing_objects.Add(src)
 	else
-		pixel_x = (ndir & 3)? 0 : (ndir == 4 ? 28 : -28)
-		pixel_y = (ndir & 3)? (ndir ==1 ? 28 : -28) : 0
-		dir=ndir
+		if(ndir)
+			pixel_x = (ndir & EAST|WEST) ? (ndir == EAST ? 28 : -28) : 0
+			pixel_y = (ndir & NORTH|SOUTH) ? (ndir == NORTH ? 28 : -28) : 0
+			dir=ndir
 		b_stat=1
 		on = 0
 	global_intercoms.Add(src)

code/game/objects/items/mountable_frames/extinguisher_frame.dm

@@ -0,0 +1,10 @@
+/obj/item/mounted/frame/extinguisher
+	name = "Extinguisher Cabinet Frame"
+	desc = "Used for building extinguisher cabinet"
+	icon = 'icons/obj/closet.dmi'
+	icon_state = "extinguisher_frame"
+	mount_reqs = list("simfloor", "nospace")
+
+/obj/item/mounted/frame/extinguisher/do_build(turf/on_wall, mob/user)
+	new /obj/structure/extinguisher_cabinet(get_turf(src), get_dir(user, on_wall))
+	qdel(src)

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -90,6 +90,7 @@ var/global/list/datum/stack_recipe/metal_recipes = list(
 	new /datum/stack_recipe("air alarm frame", /obj/item/mounted/frame/alarm_frame, 2),
 	new /datum/stack_recipe("fire alarm frame", /obj/item/mounted/frame/firealarm, 2),
 	new /datum/stack_recipe("intercom frame", /obj/item/mounted/frame/intercom, 2),
+	new /datum/stack_recipe("extinguisher cabinet frame", /obj/item/mounted/frame/extinguisher, 5),
 	null
 )