ATMOS Firelocks and more

code/game/objects/items/holosign_creator.dm

@@ -78,12 +78,20 @@
 
 /obj/item/holosign_creator/atmos
 	name = "ATMOS holofan projector"
-	desc = "A holographic projector that creates holographic fans that prevent changes in atmosphere conditions."
+	desc = "A holographic projector that creates holographic fans that prevent changes in atmosphere conditions. Somehow."
 	icon_state = "signmaker_atmos"
 	holosign_type = /obj/structure/holosign/barrier/atmos
 	creation_time = 0
 	max_signs = 3
 
+/obj/item/holosign_creator/firelock
+	name = "ATMOS holofirelock projector"
+	desc = "A holographic projector that creates holographic barriers that prevent changes in temperature conditions."
+	icon_state = "signmaker_engi"
+	holosign_type = /obj/structure/holosign/barrier/firelock
+	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/crates_lockers/closets/secure/engineering.dm

@@ -98,6 +98,7 @@
 	new /obj/item/tank/internals/emergency_oxygen/engi(src)
 	new /obj/item/analyzer(src)
 	new /obj/item/holosign_creator/atmos(src)
+	new /obj/item/holosign_creator/firelock(src)
 	new /obj/item/watertank/atmos(src)
 	new /obj/item/clothing/suit/fire/atmos(src)
 	new /obj/item/clothing/head/hardhat/atmos(src)

code/game/objects/structures/holosign.dm

@@ -67,8 +67,8 @@
 	rad_insulation = RAD_LIGHT_INSULATION
 
 /obj/structure/holosign/barrier/atmos
-	name = "holo firelock"
-	desc = "A holographic barrier resembling a firelock. Though it does not prevent solid objects from passing through, gas is kept out."
+	name = "holo fan"
+	desc = "A holographic barrier resembling a tiny fan. Though it does not prevent solid objects from passing through, gas is kept out. Somehow."
 	icon_state = "holo_fan"
 	density = FALSE
 	layer = ABOVE_MOB_LAYER
@@ -81,7 +81,16 @@
 	. = ..()
 	air_update_turf(TRUE)
 
-/obj/structure/holosign/barrier/atmos/blocksTemperature()
+/obj/structure/holosign/barrier/firelock
+	name = "holo firelock"
+	desc = "A holographic barrier resembling a firelock. Though it does not prevent solid objects or gas from passing through, temperature changes are kept out."
+	icon_state = "holo_firelock"
+	density = FALSE
+	anchored = TRUE
+	alpha = 150
+	resistance_flags = FIRE_PROOF
+
+/obj/structure/holosign/barrier/firelock/blocksTemperature()
 	return TRUE
 
 /obj/structure/holosign/barrier/cyborg