Ventis Forever Firebox – OCV-RR-36/42 – 07-10-2020 rev4 9
11. Chase Construction
A chase is a vertical structure built to enclose the
fireplace and venting system. Vertical chimneys
that run on the outside of a building must be
installed inside a chase. Local Building Codes must
be checked.
In cold climates it is recommended to insulate the
chase. The chase should be constructed in the
manner of all outside walls of the home to prevent
cold air drafting problems. The chase should not
break the outside building envelope in any manner.
All outer walls must be insulated.
Building codes require a false ceiling and firestop
at each floor of the chase or every 10 feet of clear
space to control the spread of fire. Walls ceilings,
and base plates at the first floor should be
insulated (figure 3.3). Vapor and air infiltration
barriers should be installed in the chase as per
regional codes. Holes and other openings should
be caulked or filled with insulation.
WARNING!
You must install false ceilings and
firestops at each floor of the chase
or every 10 feet to control the spread of fire.
WARNING! RISK OF FIRE
DO NOT seal the area between the
firestop opening and the chimney pipe.
A chase is constructed using framing and siding
materials. The factors below must be
considered before building the chase.
Maintain a 2-inch clearance around the
chimney pipe.
The chase top must be constructed of a
noncombustible material.
In cold climates the walls of the chase
should be insulated to the level of the false
ceiling. This will help reduce heat loss from
the home around the fireplace.
WARNING! RISK OF FIRE.
You must maintain a 2-inch air space clearance
to insulation and other material surrounding
the chimney system.
• Insulation in the chase must be firmly secured
to prevent accidental contact with the
chimney pipe.
• Openings must be blocked to prevent blown
insulation from entering and making contact
with the fireplace or chimney pipe.
• Failure to prevent contact between insulation
or other material and the chimney system
may cause overheating and fire.
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