Installation Guide

PG 18
1. Cut and frame opening to provide a minimum of 2” clearance on all sides of the
chimney. Be sure to maintain the proper clearance to combustibles for the
connector pipe.
2. Bolt on the Roof Support Brackets to the Roof Support Band using the supplied
hardware. Attach the Roof Support Brackets to the floor joists using (4) 8-penny
nails or (4) #8, 1-½” screws per side (Fig 18).
3. Determine how much AF-HST chimney will be extending into the room (minimum
of 3” below the framing), and attach the Roof Support Band to the chimney
section by tightening the bolt. Secure it with the supplied hardware.
4. Install a Firestop Radiation Shield below the finished ceiling or framing members.
Note: You will need to modify the Firestop Radiation Shield by cutting down the
metal cylinder to fit below the Roof Support Bracket. The modified Firestop
Radiation Shield can only be used when installed with the Roof Support Bracket
in this type of installation. Use a standard Firestop Radiation Shield at all other
locations where the chimney passes through a floor or ceiling (including where
the chimney passes into the attic if applicable).
5. Refer to steps 7-10 in the Ceiling Supported Installation section to complete the
Roof Supported Installation (page 9-11).
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