RV Furnace Duct Collar | 4" | 31474 | Universal Fit

Replace the duct collar on your RV furnace with the Dometic (Atwood) / Suburban Replacement Furnace Duct Collar (Part #31474). 4" duct collar for standard RV furnace ducting — compatible with nearly all Suburban, Dometic, and Atwood furnaces on the market.

Universal 4" Duct Collar — Same Across All Brands

Important compatibility note: all 4" duct collars are the same regardless of brand. This 31474 collar works on:

• Suburban furnaces
• Dometic furnaces
• Atwood furnaces
• Nearly all RV furnaces on the market using 4" ducting

Brand-specific 4" duct collars are functionally interchangeable.

Standard 4" Duct Hose Fitment

Designed for use with standard 4" ducting hoses to transport hot air from the propane furnace to the RV living area.

Dimensions

• Duct Size: 4"
• Flange Diameter: 5"
• Depth: 1"

⚠️ Professional Installation Recommended

Installation should be performed by a qualified RV service technician to ensure proper sealing and airflow.

Key Features

• Genuine Dometic/Atwood-branded 4" furnace duct collar
• Part number: 31474
• Universal 4" collar — same across Suburban, Dometic, Atwood brands
• Compatible with nearly all RV furnaces using 4" ducting
• Flange diameter: 5"
• Depth: 1"

Specifications

• Brand: Dometic (Atwood)
• Part Number: 31474
• Type: RV Furnace Duct Collar
• Duct Size: 4"
• Flange Diameter: 5"
• Depth: 1"
• Compatibility: Nearly all Suburban, Dometic, and Atwood RV furnaces using 4" ducting (universal 4" collar fitment)