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AllFuel HST

36" Square Ceiling Support Box for 6" Inner Diameter Class-A Chimney Pipe

36" Square Ceiling Support Box for 6" Inner Diameter Class-A Chimney Pipe

Regular price $158.76 USD
Regular price Sale price $158.76 USD
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The 36" Square Ceiling Support Box provides safe passage of double wall chimney pipe through your floor or ceiling and supports the weight of the chimney in through the ceiling installations.

The Ceiling Support Box can support a maximum of 50-ft of chimney pipe and includes trim to provide a finished look inside the room. The support box and trim is painted black to match the black single wall stove pipe.

Attached to the bottom of the ceiling support box is a twist lock connection for the Stove Pipe Adapter to connect (sold separately). The support box and trim is painted black.


The adapter section of our Ceiling Support Box's are made of 304 stainless steel while the box itself is made of galvanized steel (as it is not exposed to any corrosive elements).

  • 304 stainless steel/galvanized steel


Certified and listed to the UL 103HT standard and designed for appliances that are listed for use with a 2100 Degree Fahrenheit High Temperature chimney system. It can be used with wood stoves, fireplaces, fireboxes, furnaces, boilers, water heaters, pizza ovens and other residential heating appliances fueled by wood, gas, coal or oil.

Note: Do not use with forced draft, positive-pressure appliances.

The UL 103HT chimney is designed and tested for maximum continuous use at 1000 degrees Fahrenheit. UL certification requires a stringent and rigorous test including a one hour burn at 1400 degrees Fahrenheit and three - ten minute burns at 2100 degrees Fahrenheit.


Always keep at least a 2-inch clearance between chimney pipe and any combustible materials.

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