Installation Guide
PG 2 
For the most up-to-date installation instructions, planning 
guides, and video instructions visit our Learning Center at 
https://allfuelhst.com/pages/learning-center-home 
Contents 
Clearances…………………………………………………………………………….....3 
Permits………………………………………………………………………………..….3 
Model AF-HST Applications………………………………………………………...….3 
Chimney Diameter…………………………………………………………………...….3 
Chimney Height……………………………………………………………………..…..3 
Chimney Placement………………………………………………………………….....4 
Chimney Enclosure Requirements………………………………………………..…..4 
Cold Climate Installation………………………………………………………………..5 
Stove Recommendations……………………………………………………………....5 
Step-By-Step Installation Instructions………………………………………………...5 
Ceiling Supported Installation……………………………………………………….....5 
Flat Ceiling Installation……………………………………………………………….....7 
Vaulted Ceiling Installation……………………………………………………………..7 
Cathedral Ceiling Installation…………………………………………………………..7 
Multi-Story Installation…………………………………………………………………..8 
Offset Elbow Installation…………………………………………………………...….11 
Extended Roof Brace Installation…………….………………………………….......13 
Roof Supported Installation………………………………………………………......14 
Tee-Supported Installation…………………………………………………………....19 
Masonry Fireplace Installation………………………………………………………..23 
Zero-Clearance Fireplace Installation……………………………………………….25 
Chimney Maintenance…………………………………….…………………………..26 
AllFuel HST Inc    www.allfuelhst.com  Toll Free: (833) 326-8368 










