Discerning Furnace
Discerning Furnace restricts what a furnace accepts, so only items that can be smelted enter the input slot, which keeps hoppers and other automation from clogging furnace arrays.
What it does
The filter applies to vanilla furnaces and to modded furnaces that follow the vanilla input rules, limiting the input slot to items with a smelting recipe. Items that cannot be smelted are refused, so a hopper line feeding several furnaces does not jam on a stray item.
The filtering works on both sides of the connection. On the client, the mod stops a player from inserting an unsmeltable item through the furnace screen. On a server, it stops hoppers and other blocks from inserting one. Single-player worlds run both checks together. The mod is client-side and server-side in the same package, and it is useful on servers that run automated smelting.
The mod is published for Fabric and Quilt across 34 release versions, 1.17 – 26.3. Its latest files are 1.3.2+MC26.1-26.3.x for 26.3, dated 2026-09-26. The source code is open source under the MIT License, and an issue tracker and translation project are available.
Key features
Smeltable-only input
The input slot accepts only items that a furnace can smelt, so other items never sit in it.
Player and automation checks
Manual insertion through the screen and insertion from hoppers or other blocks are both filtered.
Vanilla and modded furnaces
The filter covers vanilla furnaces and modded furnaces that use the same input rules.
Small code footprint
The filtering logic is short, so it adds little to the game beyond the restriction itself.
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Automated smelting lines
Hopper lines that feed a row of furnaces keep moving when unsmeltable items are kept out of the input slots.
Who it’s for: The mod suits players who run automated smelting and server owners who want furnace lines to stay clear of stray items.
How it compares
Sandblast is server-side required, client optional, under the MIT License, with files for 1.14 – 26.2. More furnace crafts is client and server, under All rights reserved, covering 1.12.2 – 1.21.8. Brick Furnace is client and server, open source under the MIT License, and covers 1.14.4 – 26.2. Discerning Furnace focuses on input filtering for furnaces and does not change crafting.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Discerning Furnace | Fabric and Quilt | 1.17 – 26.3 | Client or server, optional | 2026-09-26 |
| Sandblast | Fabric, Forge, NeoForge and Quilt | 1.14 – 26.2 | Server required, client optional | 2026-06-21 |
| More furnace crafts | Fabric, Forge, NeoForge and Quilt | 1.12.2 – 1.21.8 | Client and server | 2026-10-04 |
| Brick Furnace | Fabric, Forge, NeoForge and Quilt | 1.14.4 – 26.2 | Client and server | 2026-09-06 |
Questions
Does Discerning Furnace need Fabric API?
Is a Forge version available?
Which game versions does the mod cover?
In the catalog
Discerning Furnace is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
Works client-side, server-side, and in single player. On clients, it prevents the player from inserting unsmeltable items though GUIs. On servers, it prevents hoppers and other blocks from inserting unsmeltable items. Prior to version 1.0.8 there was no client-side functionality, only server-sided block insertions…
Official listing
- Modrinth page
- modrinth.com/mod/discerning-furnace
- Owner
- supersaiyansubtlety
- Published
- 2021-06-09
- Updated on Modrinth
- 2026-09-26
- Facts verified
- 2026-10-15