Dometic DFSD20121 Less-Door Furnace Diagram

The DFSD20121 less-door source includes an extended manifold and vent cover panel rather than ordinary exterior access-door assemblies. The DFSD20-family burner and motor (for a furnace rated 18,000 BTU input) appear in the model-specific list.

Use the drawing callouts, quantities and manufacturer part numbers to identify the components for this furnace. Select a linked number for product details, and check the model and serial-number range before ordering.

Parts pictured in this guide

Select an image for product details, or jump to the numbered diagram and parts list. Match the part number and furnace model before ordering.

Atwood 31501 12V DSI Furnace Ignition Board With Fan ControlPart 31501 · Drawing reference 4541

Atwood 31091 190°F RV Furnace High-Limit Safety SwitchPart 31091 · Drawing reference 4560

Dometic 36688 Atwood 2-Inch RV Furnace Duct AdapterPart 36688 · Drawing reference 4575

Atwood 31474 Aluminum 4-Inch RV Furnace Duct CollarPart 31474 · Drawing reference 4576

Dometic 31361 4-Inch RV Furnace Duct Knockout Cover PlatePart 31361 · Drawing reference 4577

Atwood 30268 LP-Gas Furnace Burner HeadPart 30268 · Drawing reference 4581

Dometic 32300 Black 12V Heat-Only RV Furnace ThermostatPart 32300 · Drawing reference 4755

Dometic 38453 White HFH-2000 RV Furnace ThermostatPart 38453 · Drawing reference 4757

Original DFSD20121 manufacturer references