initial

code/modules/atmospherics/machinery/atmosmachinery.dm

@@ -72,14 +72,15 @@
 		armor = list(MELEE = 25, BULLET = 10, LASER = 10, ENERGY = 100, BOMB = 0, BIO = 100, RAD = 100, FIRE = 100, ACID = 70)
 	..()
 	if(process)
-		SSair.atmos_machinery += src
+		SSair.start_processing_machine(src)
 	SetInitDirections()
 
 /obj/machinery/atmospherics/Destroy()
 	for(var/i in 1 to device_type)
 		nullifyNode(i)
 
-	SSair.atmos_machinery -= src
+
+	SSair.stop_processing_machine(src)
 	SSair.pipenets_needing_rebuilt -= src
 
 	dropContents()

code/modules/atmospherics/machinery/other/meter.dm

@@ -27,14 +27,14 @@
 	id_tag = ATMOS_GAS_MONITOR_LOOP_DISTRIBUTION
 
 /obj/machinery/meter/Destroy()
-	SSair.atmos_machinery -= src
+	SSair.stop_processing_machine(src)
 	target = null
 	return ..()
 
 /obj/machinery/meter/Initialize(mapload, new_piping_layer)
 	if(!isnull(new_piping_layer))
 		target_layer = new_piping_layer
-	SSair.atmos_machinery += src
+	SSair.start_processing_machine(src)
 	if(!target)
 		reattach_to_layer()
 	return ..()

code/modules/atmospherics/machinery/portable/portable_atmospherics.dm

@@ -16,7 +16,7 @@
 
 /obj/machinery/portable_atmospherics/New()
 	..()
-	SSair.atmos_machinery += src
+	SSair.start_processing_machine(src)
 
 	air_contents = new(volume)
 	air_contents.set_temperature(T20C)
@@ -24,8 +24,7 @@
 	return TRUE
 
 /obj/machinery/portable_atmospherics/Destroy()
-	SSair.atmos_machinery -= src
-
+	SSair.stop_processing_machine(src)
 	disconnect()
 	qdel(air_contents)
 	air_contents = null