diff --git a/code/modules/atmospherics/machinery/airalarm.dm b/code/modules/atmospherics/machinery/airalarm.dm
index 2313d9c71d..f924a3bc0a 100644
--- a/code/modules/atmospherics/machinery/airalarm.dm
+++ b/code/modules/atmospherics/machinery/airalarm.dm
@@ -535,7 +535,7 @@
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"set_filters" = list(GAS_CO2, GAS_MIASMA),
+					"set_filters" = list(GAS_CO2, GAS_MIASMA, GAS_GROUP_CHEMICALS),
 					"scrubbing" = 1,
 					"widenet" = 0,
 				))
@@ -562,7 +562,8 @@
 						GAS_STIMULUM,
 						GAS_PLUOXIUM,
 						GAS_METHANE,
-						GAS_METHYL_BROMIDE
+						GAS_METHYL_BROMIDE,
+						GAS_GROUP_CHEMICALS
 					),
 					"scrubbing" = 1,
 					"widenet" = 1,
@@ -582,9 +583,16 @@
 				))
 			for(var/device_id in A.air_vent_names)
 				send_signal(device_id, list(
+					"is_pressurizing" = 1,
 					"power" = 1,
 					"checks" = 1,
-					"set_external_pressure" = ONE_ATMOSPHERE*2
+					"set_external_pressure" = ONE_ATMOSPHERE*1.4
+				))
+				send_signal(device_id, list(
+					"is_siphoning" = 1,
+					"power" = 1,
+					"checks" = 1,
+					"set_external_pressure" = ONE_ATMOSPHERE/1.4
 				))
 		if(AALARM_MODE_REFILL)
 			for(var/device_id in A.air_scrub_names)
@@ -596,10 +604,15 @@
 				))
 			for(var/device_id in A.air_vent_names)
 				send_signal(device_id, list(
+					"is_pressurizing" = 1,
 					"power" = 1,
 					"checks" = 1,
 					"set_external_pressure" = ONE_ATMOSPHERE * 3
 				))
+				send_signal(device_id, list(
+					"is_siphoning" = 1,
+					"power" = 0,
+				))
 		if(AALARM_MODE_PANIC,
 			AALARM_MODE_REPLACEMENT)
 			for(var/device_id in A.air_scrub_names)
@@ -610,8 +623,14 @@
 				))
 			for(var/device_id in A.air_vent_names)
 				send_signal(device_id, list(
+					"is_pressurizing" = 1,
 					"power" = 0
 				))
+				send_signal(device_id, list(
+					"is_siphoning" = 1,
+					"power" = 1,
+					"checks" = 0
+				))
 		if(AALARM_MODE_SIPHON)
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
@@ -621,9 +640,14 @@
 				))
 			for(var/device_id in A.air_vent_names)
 				send_signal(device_id, list(
+					"is_pressurizing" = 1,
 					"power" = 0
 				))
-
+				send_signal(device_id, list(
+					"is_siphoning" = 1,
+					"power" = 1,
+					"checks" = 0
+				))
 		if(AALARM_MODE_OFF)
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
@@ -641,8 +665,12 @@
 			for(var/device_id in A.air_vent_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"checks" = 2,
-					"set_internal_pressure" = 0
+					"checks" = 0,
+					"is_pressurizing" = 1
+				))
+				send_signal(device_id, list(
+					"power" = 0,
+					"is_siphoning" = 1
 				))
 
 /obj/machinery/airalarm/update_icon_state()
diff --git a/code/modules/atmospherics/machinery/components/unary_devices/vent_pump.dm b/code/modules/atmospherics/machinery/components/unary_devices/vent_pump.dm
index a3644ed084..deafe7a9f0 100644
--- a/code/modules/atmospherics/machinery/components/unary_devices/vent_pump.dm
+++ b/code/modules/atmospherics/machinery/components/unary_devices/vent_pump.dm
@@ -178,6 +178,9 @@
 
 	var/mob/signal_sender = signal.data["user"]
 
+	if((("is_siphoning" in signal.data) && pump_direction == RELEASING) || (("is_pressurizing" in signal.data) && pump_direction == SIPHONING))
+		return
+
 	if("purge" in signal.data)
 		pressure_checks &= ~EXT_BOUND
 		pump_direction = SIPHONING