diff --git a/code/modules/ventcrawl/ventcrawl_atmospherics.dm b/code/modules/ventcrawl/ventcrawl_atmospherics.dm
index bb2d121125..f2cbb8018d 100644
--- a/code/modules/ventcrawl/ventcrawl_atmospherics.dm
+++ b/code/modules/ventcrawl/ventcrawl_atmospherics.dm
@@ -55,6 +55,12 @@
 /obj/machinery/atmospherics/proc/can_crawl_through()
 	return 1
 
+/obj/machinery/atmospherics/unary/can_crawl_through()
+	if(welded)
+		return 0
+
+	..()
+
 /obj/machinery/atmospherics/proc/findConnecting(var/direction)
 	for(var/obj/machinery/atmospherics/target in get_step(src,direction))
 		if(target.initialize_directions & get_dir(target,src))