Rheem RXGW-C01 4-Inch Flue Adapter Kit for 80% Gas Furnaces
The Rheem RXGW-C01 is the factory-listed 4" flue adapter for Rheem's 80% AFUE upflow/horizontal gas furnaces. Rheem lists it as an accessory for the R801T Classic, R801T Ultra Low NOx, R801C Classic, R802V Prestige and Endeavor Line, and Russell S802V furnace series. If you're connecting one of these furnaces to a 4-inch metal vent, this is the genuine Rheem part made for the job. It's a good fit for HVAC contractors, installers, and homeowners replacing or installing an 80% metal-vented gas furnace.
Is the RXGW-C01 the Right Flue Adapter for Your Furnace?
The RXGW-C01 is a venting accessory, not a universal fitting. Before you order, confirm that your furnace model appears in the Rheem compatibility list below. The dimensional data in Rheem's furnace specifications notes that these cabinets "may require a 3" to 4" or 3" to 5" adapter." The RXGW-C01 is the 4-inch option Rheem lists in each series' accessories table.
The right vent diameter depends on more than the furnace. Input BTU, total vent height, lateral run length, number of elbows, common venting with a water heater, and local code requirements all affect whether a 4" or 5" connection is correct. Always size the vent system using the furnace installation instructions and the National Fuel Gas Code venting tables.
Ideal for: Furnace replacements and new installs of Rheem R801T, R801C, R802V, or Russell S802V 80% gas furnaces when the vent system has been sized for a 4-inch connection.
Converting to propane? Pair this adapter with the Rheem LP Kit for R802 80% Series FP32 when setting up an 80% Rheem furnace for LP gas service.
Vent sizing guidance is general only. Actual vent requirements depend on furnace input, vent height, lateral length, elbows, common venting, and local code. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Manufacturer | Rheem |
|---|---|
| Part Number | RXGW-C01 |
| Product Type | 4" Flue Adapter Kit |
| Vent Connection Size | 4 Inch |
| Furnace Efficiency | 80% AFUE Gas Furnaces |
| Furnace Configuration | Upflow / Horizontal |
| Listed Rheem Series | R801T, R801T Ultra Low NOx, R801C, R802V |
| Listed Russell Series | S802V |
The RXGW-C01 shows up under the same "4" Flue Adapter" accessory line in several Rheem furnace spec sheets. That means one part number covers single-stage Classic models as well as two-stage variable-speed Prestige and Endeavor Line furnaces. Contractors who install several Rheem 80% furnace series can keep one adapter on the truck instead of tracking separate fittings for each product line.
Flue Adapter & Compatibility Features
RXGW-C01 4" Flue Adapter Kit
- Genuine Rheem accessory, part number RXGW-C01
- 4-inch flue connection for 80% furnace venting
- Listed in the accessories table of multiple Rheem furnace spec sheets
- Covers the 3"-to-4" adapter note in Rheem dimensional data
- Works in both upflow and horizontal furnace configurations
- One part number for single-stage and two-stage variable-speed models
- Made for Category I metal-vented 80% AFUE gas furnaces
- Useful for furnace change-outs onto existing 4" vent systems
Compatible Rheem Furnace Series
- Rheem R801T Classic 80% single-stage gas furnaces
- Rheem R801T Ultra Low NOx Classic Series
- Rheem R801C Classic Series upflow/horizontal
- Rheem R802V Prestige communicating two-stage variable speed
- Rheem R802V Endeavor Line Classic Plus Series
- Russell by Rheem S802V upflow/horizontal furnaces
Frequently Asked Questions
Which Rheem furnaces use the RXGW-C01 flue adapter?
Rheem lists the RXGW-C01 as the 4" flue adapter accessory for the R801T Classic, R801T Ultra Low NOx, R801C Classic, R802V Prestige, and R802V Endeavor Line furnaces, plus the Russell by Rheem S802V series. All of these are 80% AFUE upflow/horizontal gas furnaces.
Why would my furnace need a 4-inch flue adapter?
Rheem's dimensional data for these furnaces notes that the vent connection "may require a 3" to 4" or 3" to 5" adapter." When the vent system is sized for 4 inches, the RXGW-C01 is the Rheem-listed part for that connection.
How do I know whether I need a 4" or 5" vent connection?
Vent diameter depends on furnace input, vent height, lateral length, the number of elbows, whether the furnace shares a vent with a water heater, and local code. Use the venting tables in the furnace installation instructions and the National Fuel Gas Code, or contact Budget Heating for help.
Can the RXGW-C01 be used on a 90%+ condensing furnace?
No. The RXGW-C01 is listed only in Rheem's 80% AFUE furnace documentation. High-efficiency condensing furnaces vent through PVC and use different venting components.
Does the RXGW-C01 work on both upflow and horizontal installations?
Yes. Every furnace series that lists the RXGW-C01 is an upflow/horizontal design, and the adapter note appears in both the upflow and horizontal dimensional data tables.
Is the RXGW-C01 a genuine Rheem part?
Yes. RXGW-C01 is Rheem's own accessory part number, listed in the manufacturer's furnace specification sheets as the "4" Flue Adapter."
