diff --git a/src/kiri-mode/fdm/export.js b/src/kiri-mode/fdm/export.js
index d904c702..1d80ca06 100644
--- a/src/kiri-mode/fdm/export.js
+++ b/src/kiri-mode/fdm/export.js
@@ -80,8 +80,8 @@ FDM.export = function(print, online, ondone, ondebug) {
         nozzleTemp = process.firstLayerNozzleTemp || process.outputTemp,
         bedTemp = process.firstLayerBedTemp || process.outputBedTemp,
         fanSpeedSave = undefined,
-        fanSpeedBase = undefined,
-        fanSpeed = undefined,
+        fanSpeedBase = 0,
+        fanSpeed = 0,
         lastType = undefined,
         lastNozzleTemp = nozzleTemp,
         lastBedTemp = bedTemp,
@@ -167,9 +167,8 @@ FDM.export = function(print, online, ondone, ondebug) {
             params.firstLayerBedTemp || params.outputBedTemp :
             params.outputBedTemp || params.firstLayerBedTemp;
         fanSpeedBase = params.firstLayerFanSpeed || 0;
-        fanSpeed = layer === 0 ?
-            params.firstLayerFanSpeed || 0 :
-            params.outputFanSpeed || 0;
+        fanSpeed = layer >= (params.outputFanLayer ?? 1) ?
+            params.outputFanSpeed || 0 : fanSpeedBase;
         Object.assign(subst, {
             temp_bed: bedTemp,
             bed_temp: bedTemp,
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index dc75c7b5..f395999a 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -357,6 +357,7 @@ const conf = exports({
                 outputShellMult: 1.25,
                 outputFillMult: 1.25,
                 outputSparseMult: 1.25,
+                outputFanLayer: 1,
                 outputFanSpeed: 255,
                 outputRetractDist: 1.5,
                 outputRetractSpeed: 40,
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 5a09e6b4..03fe4f8a 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1833,6 +1833,7 @@ gapp.register("kiri.init", [], (root, exports) => {
             fdmSep:              uc.newBlank({class:"pop-sep", modes:FDM}),
             sliceShells:         uc.newInput(LANG.sl_shel_s, {title:LANG.sl_shel_l, convert:uc.toFloat, modes:FDM}),
             sliceLineWidth:      uc.newInput(LANG.sl_line_s, {title:LANG.sl_line_l, convert:uc.toFloat, bound:uc.bound(0,5), modes:FDM}),
+            outputFanLayer:      uc.newInput(LANG.ou_fanl_s, {title:LANG.ou_fanl_l, convert:uc.toInt, bound:uc.bound(0,255), modes:FDM}),
             fdmSep:              uc.newBlank({class:"pop-sep", modes:FDM}),
             sliceTopLayers:      uc.newInput(LANG.sl_ltop_s, {title:LANG.sl_ltop_l, convert:uc.toInt, modes:FDM}),
             sliceBottomLayers:   uc.newInput(LANG.sl_lbot_s, {title:LANG.sl_lbot_l, convert:uc.toInt, modes:FDM}),
@@ -1851,7 +1852,7 @@ gapp.register("kiri.init", [], (root, exports) => {
             fdmSep:              uc.newBlank({class:"pop-sep", modes:FDM, show:isNotBelt}),
             firstLayerNozzleTemp:uc.newInput(LANG.fl_nozl_s, {title:LANG.fl_nozl_l, convert:uc.toInt, modes:FDM, show:isNotBelt}),
             firstLayerBedTemp:   uc.newInput(LANG.fl_bedd_s, {title:LANG.fl_bedd_l, convert:uc.toInt, modes:FDM, show:isNotBelt}),
-            firstLayerFanSpeed:  uc.newInput(LANG.ou_fans_s, {title:LANG.ou_fans_l, convert:uc.toInt, bound:uc.bound(0,255), modes:FDM}),
+            firstLayerFanSpeed:  uc.newInput(LANG.ou_fans_s, {title:LANG.ou_fans_l, convert:uc.toInt, bound:uc.bound(0,255), modes:FDM, show:isBelt}),
             fdmSep:              uc.newBlank({class:"pop-sep", modes:FDM, show:isNotBelt}),
             firstLayerYOffset:   uc.newInput(LANG.fl_zoff_s, {title:LANG.fl_zoff_l, convert:uc.toFloat, modes:FDM, show:isBelt}),
             firstLayerFlatten:   uc.newInput(LANG.fl_flat_s, {title:LANG.fl_flat_l, convert:uc.toFloat, modes:FDM, show:isBelt}),
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 7097ea73..a97be36d 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -671,6 +671,8 @@ self.kiri.lang['en-us'] = {
     ou_flml_s:      "solid factor",
     ou_spml_s:      "infill factor",
     ou_exml_l:      ["extrusion multiplier","0.0 - 2.0"],
+    ou_fanl_s:      "fan on",
+    ou_fanl_l:      ["layer # to turn on fan","layers start at 0"],
     ou_fans_s:      "fan speed",
     ou_fans_l:      "0 - 255",