AllFuel HST 11 Inch Cathedral Ceiling Kit with Spark Guard Chimney Cap - Pitch Flashing - 8 Inch Dia

Hello, Both options are available – the cathedral ceiling assembly can be purchased as a complete kit or piece by piece. For an 8-inch AllFuel HST system through a cathedral ceiling with a 24-inch support box, the matching kit is the [AllFuel HST 24 Inch Cathedral Ceiling Kit with Spark Guard Chimney Cap - Pitch Flashing - 8 Inch Dia](https://www.efireplacestore.com/alf-hst8-cck-24rf17rc01.html). Please select the 7/12 - 12/12 pitch flashing option on that page, which will accommodate your 8/12 pitch. The kit includes the stove adapter, the 24-inch cathedral ceiling support box, the pitch flashing, the storm collar, and the spark guard chimney cap. It does not include the lengths of chimney pipe, which are ordered separately based on the total height of your run. Each of these components is also sold individually if you prefer to assemble the system part by part. This includes the [AllFuel HST Square Ceiling Support for 8 Inch Diameter Chimney Pipe](https://www.efireplacestore.com/alf-bl-ev-rb-sht8scs11-p.html) (offered in 11, 24, and 36-inch heights) and [AllFuel HST 8 Inch Diameter Double Wall Chimney Pipe](https://www.efireplacestore.com/alf-bl-ev-rb-sht8ss12.html) lengths, along with the roof flashing, storm collar, and rain cap available on their own pages. Before ordering, please confirm that the support box drops into a framed opening in the ceiling and check your rafter layout at the penetration point. AllFuel HST notes in the [installation manual](https://www.efireplacestore.com/files/Manuals/1JCYh4jt1ZSg6scCZl6h7w8AtOnDC_BOD.pdf) that the 1-inch wall thickness allows the pipe to pass through 16-inch on-center framing. To ensure we can specify the rest of the system correctly, please reply with the stove or appliance being vented, whether the connector pipe from the appliance is already in place and its brand if so, and the approximate height from the appliance flue collar to the top of the roof. Chimney and stove pipe systems are brand-specific and cannot be mixed between manufacturers, so we need to confirm exactly what you are connecting to. Additionally, we offer kits from other manufacturers such as DuraVent, Selkirk, and Shasta Vent. If you would like us to assemble the full system for you, please provide your shipping zip code or use the [venting quote request form](https://www.efireplacestore.com/quote.html). We will then create an itemized quote, which is free and locks in the price for 30 days. You can also plan your system using our [Virtual Venting Assistant](https://www.efireplacestore.com/virtual-venting-assistant.html).