diff --git a/code/ATMOSPHERICS/components/unary_devices/passive_vent.dm b/code/ATMOSPHERICS/components/unary_devices/passive_vent.dm
index 632b75c0dc8..d3118575cfd 100644
--- a/code/ATMOSPHERICS/components/unary_devices/passive_vent.dm
+++ b/code/ATMOSPHERICS/components/unary_devices/passive_vent.dm
@@ -21,11 +21,39 @@
 	..()
 	
 	if(!node)
-		return
-
-	var/datum/gas_mixture/removed = air_contents.remove(volume)
-	loc.assume_air(removed)	
-	air_update_turf()
+		return 0
+	
+	var/datum/gas_mixture/environment = loc.return_air()
+	
+	var/pressure_delta = air_contents.return_pressure() - environment.return_pressure()
+	
+	// based on pressure_pump to equalize pressure
+	// already equalized
+	if(abs(pressure_delta) < 0.01)
+		return 1
+	
+	if(pressure_delta > 0)
+		// transfer from pipe air to environment
+		if((air_contents.total_moles() > 0) && (air_contents.temperature > 0))
+			var/transfer_moles = pressure_delta * environment.volume / (air_contents.temperature * R_IDEAL_GAS_EQUATION)
+			transfer_moles = min(transfer_moles, volume)
+	
+			var/datum/gas_mixture/removed = air_contents.remove(transfer_moles)
+			loc.assume_air(removed)
+			air_update_turf()
+	else
+		// transfer from environment to pipe air
+		pressure_delta = -pressure_delta
+		if((environment.total_moles() > 0) && (environment.temperature > 0))
+			var/transfer_moles = pressure_delta * air_contents.volume / (environment.temperature * R_IDEAL_GAS_EQUATION)
+			transfer_moles = min(transfer_moles, volume)
+	
+			var/datum/gas_mixture/removed = loc.remove_air(transfer_moles)
+			air_contents.merge(removed)
+			air_update_turf()
+	
+	parent.update = 1
+	return 1
 
 /obj/machinery/atmospherics/unary/passive_vent/update_underlays()
 	if(..())