diff --git a/homedecor/bathroom_sanitation.lua b/homedecor/bathroom_sanitation.lua
index 9628721d..b83e69a8 100644
--- a/homedecor/bathroom_sanitation.lua
+++ b/homedecor/bathroom_sanitation.lua
@@ -195,10 +195,7 @@ homedecor.register("shower_tray", {
 			{  0.45, -0.45, -0.45, 0.5, -0.4, 0.45 }
 		},
 	},
-	selection_box = {
-		type = "fixed",
-		fixed = { -0.5, -0.5, -0.5, 0.5, -0.4, 0.5 },
-	},
+	selection_box = homedecor.nodebox.slab_y(0.1),
 	groups = {cracky=2},
 	sounds = default.node_sound_stone_defaults(),
 	on_destruct = function(pos)
diff --git a/homedecor/climate-control.lua b/homedecor/climate-control.lua
index cd495640..c9451851 100644
--- a/homedecor/climate-control.lua
+++ b/homedecor/climate-control.lua
@@ -145,11 +145,7 @@ homedecor.register("space_heater", {
 	}
 })
 
-local r_cbox = {
-	type = "fixed",
-	fixed = { -0.5, -0.5, 0.25, 0.5, 0.5, 0.5 }
-}
-
+local r_cbox = homedecor.nodebox.slab_z(-0.25)
 homedecor.register("radiator", {
 	mesh = "homedecor_radiator.obj",
 	tiles = {
diff --git a/homedecor/misc-nodes.lua b/homedecor/misc-nodes.lua
index 1cab08da..333961e4 100644
--- a/homedecor/misc-nodes.lua
+++ b/homedecor/misc-nodes.lua
@@ -26,8 +26,8 @@ homedecor.register("ceiling_tile", {
 
 local rug_types = {
 	{ "small",   "homedecor_small_rug.obj" },
-	{ "large",   { -0.5, -0.5, -0.5, 0.5, -0.4375, 0.5 } },
-	{ "persian", { -0.5, -0.5, -0.5, 0.5, -0.4375, 0.5 } }
+	{ "large", homedecor.box.slab_y(0.0625)},
+	{ "persian", homedecor.box.slab_y(0.0625)}
 }
 
 for i in ipairs(rug_types) do