fucking combifan

code/game/objects/items/holosign_creator.dm

@@ -92,6 +92,14 @@
 	creation_time = 0
 	max_signs = 3
 
+/obj/item/holosign_creator/combifan
+	name = "ATMOS holo-combifan projector"
+	desc = "A holographic projector that creates holographic combi-fans that prevent changes in atmosphere and temperature conditions. Somehow."
+	icon_state = "signmaker_atmos"
+	holosign_type = /obj/structure/holosign/barrier/combifan
+	creation_time = 0
+	max_signs = 3
+
 /obj/item/holosign_creator/medical
 	name = "\improper PENLITE barrier projector"
 	desc = "A holographic projector that creates PENLITE holobarriers. Useful during quarantines since they halt those with malicious diseases."

code/game/objects/structures/holosign.dm

@@ -93,6 +93,24 @@
 /obj/structure/holosign/barrier/firelock/blocksTemperature()
 	return TRUE
 
+/obj/structure/holosign/barrier/combifan
+	name = "holo combifan"
+	desc = "A holographic barrier resembling a blue-accented tiny fan. Though it does not prevent solid objects from passing through, gas and temperature changes are kept out."
+	icon_state = "holo_combifan"
+	max_integrity = 30
+	density = FALSE
+	anchored = TRUE
+	alpha = 150
+	CanAtmosPass = ATMOS_PASS_NO
+	resistance_flags = FIRE_PROOF
+
+/obj/structure/holosign/barrier/combolock/blocksTemperature()
+	return TRUE
+
+/obj/structure/holosign/barrier/combolock/Initialize()
+	. = ..()
+	air_update_turf(TRUE)
+
 /obj/structure/holosign/barrier/cyborg
 	name = "Energy Field"
 	desc = "A fragile energy field that blocks movement. Excels at blocking lethal projectiles."