
White Rodgers 21M51U-843 Universal 2-Stage Furnace Control Kit
Part/SKU: 21M51U-843
| Weight | 5 lbs |
|---|---|
| Condition | New |
| Manufacturer Part Number | 11000806 |
| Brand | Atco Rubber Products |
$13.34
In stock — available to order.
Sold individually. Each quantity ordered is one unit. Kits are one complete kit; products sold by length use the stated length unit.
Available to order.
Enter the total quantity you need. We will confirm availability and a quote before you order.
Request this quantity →Need a firm ship date? Availability may include supplier stock. Confirm availability before ordering for time-sensitive work.
The Atco #010 Insulated Sleeve is constructed from a thick fiberglass insulation blanket encased in a reinforced metalized polyester vapor barrier jacket. Designed for HVAC duct and pipe insulation, this sleeve delivers reliable R-8 thermal performance while protecting against moisture and condensation.
Diameter: 6″
Length: 5 ft
Insulation Rating: R-8
Insulation Core: Fiberglass Blanket
Outer Jacket: Reinforced Metalized Polyester
Vapor Barrier: Yes
Manufacturer: Atco Rubber Products
MFG#: 11000806
REM#: 8H996F
✔ R-8 energy-efficient insulation
✔ Reinforced vapor barrier jacket
✔ Reduces condensation & energy loss
✔ Easy slip-on installation
✔ Professional HVAC-grade construction
Insulating round metal duct
HVAC supply and return runs
Mechanical room duct insulation
Residential and commercial HVAC systems
This sleeve is commonly used by HVAC contractors for insulating ductwork to meet energy codes and improve system efficiency.
Match the manufacturer part number and equipment model to the listing. Check connection sizes, fuel type, pressure or capacity, voltage and dimensions where applicable. A similar appearance or part number alone does not confirm compatibility.
For help, send a parts inquiry with the part number, equipment model, label photos and quantity. Manufacturer documents and item-specific information, when supplied, are in the product details above.
Availability may include our inventory and supplier sources. Listed stock does not by itself confirm immediate dispatch. Ask us to confirm a ship date before ordering for time-sensitive work.
Shipping methods and charges appear at checkout where available. Freight, oversized and specially handled items may require a quote. See our Shipping Policy for processing periods, restrictions and delivery information.
More products in this category. Compare specifications and fit for your application.

Part/SKU: 21M51U-843

Part/SKU: 720-406

Part/SKU: 8145-00

Part/SKU: A19ABC-24C